Stay out of the off-topic section (Except maybe for games) until you get used to the forums.
Feel free to post your suggestions, but if you have a lot of them at the same time, either make one post with all of them in it, or edit an existing post. You can make new topics once your old ones have either been made or you've given up on them. Also, don't double post (Post multiple times in a row) unless you are bumping (Putting your topic on the front page of that section). Also, don't bump your topic unless it goes off the front page.
These forums are pretty harsh and have a steep learning curve, so it's better to lurk for the first few weeks than to post.
EDIT: Read the rules. Don't get banned for being stupid.