Remember, Wiki Magic will not only provide examples for Your Trope, but format them correctly, add a decent page summary and then launch the whole thing. Therefore the best approach is a one sentence description with at most one example, after which you never look at again:
Alternately, just use one or two examples to define what your trope is.
Use series known for having lots of tropes, so all the tropers will have already seen that one. No need to explain why they are your trope. After all, if you pick two series that have nothing to do with the other, they can't have more than one thing in common. For example:
When in doubt, name Your Trope "Crowning Moment of..." or "Everything's ___ with ___". After all, we're pretty short on those at the moment and definitely need a few more.
If still in doubt when it comes to a title, append the word 'Gambit' or 'Syndrome' to whatever you've come up with, regardless of whether it actually is a gambit or syndrome. These words don't actually have any meanings and are just intensifiers.
Your Trope is only covered by existing entries if said entries are described using exactly the same words. Otherwise it's probably just a subtrope/supertrope/sister trope. Insist that the existing entry be accordingly split into multiple entries, each coincidentally containing the exact same list of examples.
Remember that the Japanese do everything inherently different to everybody else. Thus, remaking existing tropes with "In Japan" or "Anime Version" tacked on is perfectly acceptable and a great idea. Don't worry if people start pointing out that your trope of "Baka Ball (Anime version of Idiot Ball)" is redundant, they're just xenophobes acting out of their irrational fear and hatred of other cultures. Remind them of this in the most insulting way possible.
Make sure you name every trope after your favorite example. Normal trope names just aren't awesome enough to properly capture that really cool moment you just saw on Your Show, so why would you go with something boring like Highly-Visible Ninja when The Naruto is so much more awesome?
Bonus Points if the trope already exists, or if the character you're naming it after is highly obscure. If people don't recognize your example then they just haven't been watching the right media. As always, make sure to point this out to them in the form of a string of curses and insinuations about their mother's sexuality.
Remember, on a Wiki where anyone can launch any trope at any time, nothing is a surer sign of quality than precedent! If people criticize Your Trope, defend it by pointing out some even worse ones that already exist.
All tropes are either awesome or badges of shame. Any trope with objective criteria shouldn't even be thought of, let alone be created. Good tropes should be filled with nothing but praise and be described as defining points of "awesome-ness", while bad tropes should contain as much bile and contention as you can possible muster. Be sure to base all of your examples according to your personal preferences, too.
Exception: Captain Obvious can save the day with knowledge of said acronym or abbreviation.
If you feel that you must provide something more for Wiki Magic to work with than a title, "Self Explanatory" and "How Did We Miss This One?", writing a nice long essay on the sociological, political, psychological, historical or scientific (or some combination of them — bonus points for covering all of them in one essay) ramifications of the underlying idea is an excellent choice. If you can't write at least 500 to 1000 words, try harder — someone might misunderstand what you meant.
Good YKTTWs are like volleyball, they're about 70% bumps. Never mind that you can bump the YKTTW by editing it without changing anything, what people love to see is 45 replies, 30 of which are "Bump!" or "YKTTW Bump!"
The more, the better. Submitting YKTTWs is a badge of pride, whether they are ultimately tropable or not. Twenty per day is the baseline for good YKTTWing.
Always add "Up for Grabs" to every YKTTW you start from the very beginning. If other people really like your proposal, they'll be happy to adopt and launch it, right?
If you have a response to someone who replies, it is required that you edit their reply. Who wants to read a conversation? Just spoil tag the original post (now that you can't overwrite).Oh, come on. Nobody would do anything so inconsiderate as that.
If you see a trope you think is stupid, just launch it to discard. No need to bother with an explanation. The original poster will immediately find their trope in the launches list and understand exactly why you felt their idea was not tropeworthy.
Don't put any examples - your vague (or media specific) title and 1 sentence explanation is clear enough. Do be sure to punctuate with Seen It a Million Times anyway, though.
If you must add examples, XJustX should get the point across. After all, everyone here has read and seen all the same media you have— if they haven't, well, they're notreal tropers.
Remember to immediately shut down any jokes or wit that you don't like. If you don't like it, then it shouldn't be there, right? Besides, since when is TV Tropes supposed to be about having fun?
Using YKTTW is really more just a formality than anything else. Just go ahead and put your trope up as it is. No one will mind. What is Wiki Magic even for, after all, if not to let you be lazy?
Anyone who criticizes Your Trope is doing so because they hate you. React accordingly. Be sure to use the phrases "nonconstructive criticism", "hate speech", "ignorant", and "narrow-minded" as much as possible. If they keep arguing then you can start calling them Nazis, assuming you weren't already doing so. Don't worry about getting banned. That just proves you were right all along. Why else would you have been banned except that you were totally right and the stupid, pea-brained mods couldn't handle it?
Remember that this also works in reverse. See a trope on YKTTW that you don't like, or that is competing with Your Trope? Bash the crap out of it! It doesn't matter if everyone else supports the trope, they're all just hive-mind sheeple who don't see why the trope sucks! Of course, don't forget that anyone can edit the original post too, not just the person who first suggested the YKTTW. Vandalizing it (Penis! LOL!!!) is a great way of making your point!
If a number of responses point out that We Already Have This, and give the name of the trope your YKTTW supposedly duplicates, you have two options: you can ignore them completely and keep adding examples, or you can explain in minute detail how your trope is different from the trope that already exists. The more minute or subjective the difference, the better. By no means is it acceptable to respond "Oh, okay then," and discard the proposal.
If your trope is rejected for some reason, look for existing tropes that you think also fit that reason and send them to the Cut List. Everyone will appreciate that you want to help the wiki by getting rid of other pages like the rejected one, even if one of the pages would create Red Links in over 2000 other pages, and even if the fact that that page exists is the entire reason why yours was rejected (ie. because Yes We Do Have This One.)
If your work is removed, just upload it again with a message to the mods stating that you intend on doing that no matter how many times it's removed. Edit Wars are in no way against the rules of the site and won't get you banned. In fact, the mods will probably admire your dedication and let you have your way.
After you've launched the trope, just ignore the post-launch message and the red link on the Launches page and let the wiki-gnomes copy-paste your YKTTW contents to the new page. That's what Wiki Magic and teamwork are all about.
Finally, just launch Your Trope without regard to replies! No one in YKTTW will mind!