7. Spell Check: Try to keep the grammatical errors low. It is okay to mess up a couple of times but if you mess up a lot, people will just post your error and laugh. Nobody will take a thread seriously with many spelling and grammar errors.
8.Stay Consistent: You want to stay consistent throughout the thread. What this meand is that don't go through most of the post with everything one color and one font and at the end make everything really big, a new font and a new color. It doesn't look right and is a bad ides.
Also, if you're going to preach the do's and don'ts of how to make a rant, it might help if you've composed at least one quality rant of your own.