I've been airsofting for a couple of years, and I think I'll just put some info here on some general rules and tips for airsoft (If you are trying to get more serious than backyard)
1. wear eye protection! No, shitty glasses don't work. You have only one set of eyes, so make sure to get good protection. A paintball mask works, things I also recommend are Revision goggles, Arena Flakjaks (Only 21 shipped here
http://www.goggleoverstock.com/index.html I got mine there) or ESS goggles.
2. Don't play backyard airsoft that is really easy to see or with a loadout (loadout=gear you wear while playing), because as my stupid friends have done, they have had the police called on themselves before. And depending on where you live, the police can be grade-A asshats about it. Go to places like airsoftforum.com to find a place nearby, or just do a google search.
3. FPS doesn't matter. It really doesn't. It doesn't increase accuracy, and to be honest the higher the FPS the more likely you are to hurt someone.
Those are just 3 things I find important. I'll edit this post later today and post a ton of pictures.