It may seem silly, but it's necessary.
First of all, MAKE SURE YOUR LINKS WORK! There have been a few ads posted here that do not have working links. It kind of defeats the whole purpose of the ad if the link to your home page does not work.
You don't have to be the manager of the forum, but you must be able to do the coding correctly.
Also, make sure to label what type of rp you're advertising, or make it obvious in the description. You may include pictures as well.
That will be all. Thanks.