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Go here to read the rules in full:
http://www.4chan.org/rulesQuick simple rules to live by:
Respect Admins and Janitors! (and yes, janitors on this site is a real job. They don't have the power to ban you right away, but they can have an admin to look into/do it for them. They're job is important to keep 4chan relatively organized and child porn free. Respect them as much as admins)
If you post something for a request then you must upload few related images. Ie: Requesting cat ears pics, but also dumping(uploading) what you have. This applies for most boards.
No straight up requests without related images. This is mostly important on /e/, /h/, or /u/, but you shouldn't forget other boards. This really annoys everyone if you do it and it could result in a temp or perma ban. There's a board for requests on /r/
Taking the time to type a quick description will get you results quicker.
Masturbation is ok on /e/, but penises or semen. Girl-on-girl belongs on /u/, but can often wonder into /e/ if it suits the topic/board.