Try
searching the forums for legal, legality, riaa, or similar words.
Some say to keep your shared below 1000 files. I don't know. There are many people using p2p programs and i think the chances of the riaa oe mpaa going after the average user is very slim. I personally don't worry about it, but you take your chances.
If they come knocking at your door, anything thing i say here won't mean squat
.