listen to Thundercactus and Wildcard...they've done it over and over and seen 100's of guys go through starting into airsoft.
- save up for a "good" gun - $400-600
There are "packages" you can get on the classifieds...mags, gun, extras...for the same price as a new good gun.
- while you're saving up for the gun...get boots/goggles/vest/loader/bbs/charger/etc...
Don't rush...it'll kill you to take it slow...but it's worth it in the long run.
When buying a used gun....especially your first....BUY LOCAL...try it out before you buy and hold it in your hands. If a local guy won't let you see/shoot it...don't buy it. Be 100% satisfied with it in your hands before you seal the deal.