This page covers the general information, gear issues, and prerequisites that you need to know and understand before you attempt to freefly.
The following was "borrowed" from a fantastic BPA Skydive Magazine article. They nailed it, so rather than duplicate the effort, I'll simply include it here and hope that they don't mind.
If you just got your A license, there's still a lot you can learn about flying on your belly. Your jumpmasters didn't award you your license because they thought you could fly. They gave you that license because they believe there's a reasonable chance that you won't kill anybody. Belly to earth is the pull position, the track away position, and the emergency exit position. Plus, if you ever want to make money doing tandems, AFFs, or camera, belly skills pay the bills. Learning and doing things you've never done before is what's fun, so if there's still plenty that you can learn to do on your belly, then I encourage you to do that. However, if you have a burning desire to dabble in freefly, it's reasonably safe to do so as long as you do it smart. Documenting how to "do it smart" is the purpose of Taihiko, so you're off to a good start.
The most crucial one is - you have to be able to fly headup (sit) before you can safely learn to fly headdown. Most people start with headup flying, and I think that's a fine way to go. Skydive U and lots of other really talented coaches are saying that you should learn backflying first. That's certainly fine, too. Here's a basic progression:
You're going to stink at first, but that's ok, learning is what's fun. Just remember that the next step after sucking isn't total awesomeness. It's just barely better than sucking. Most people (including and perhaps especially me) tend to self-assess their abilities a little on the high side of reality. Be realistic, you don't wanna scare people in freefall with your aggressive zoominess because then nobody will want to jump with you.
Faster fallrate = shorter skydive. Your internal clock is going to be off if you're a beginning sitflyer.
Get into the habit of performing a proper breakoff even when you're doing your solos. The keys to a safe freefly break off are:
The recommended way to do this is to go to your head, turn away from the formation, and fly away. This allows you to most easily maintain fallrate while providing excellent visibility in front of you and above you. As soon as you're clear, roll to your belly track and begin slowing your fall rate.
For people who are sitflying but can't fly on their head yet, this typically means beginning the track in a steep delta, but look above you as you turn away! Get out from underneath anybody who happens to be above you before you transition.