Seconded on the AK. Much easier to find a reliable, full metal/wood AK than any other type. For 300-400$, you'll get a rifle that does the job, a V3 mechbox that'll live through puddles, marshes and snow banks and has loads of accessories. Do a search for images of tactical AK's if you're into the Western look (with rails and optics, etc.).
Your budget for getting into your first airsoft game next season, when you turn 18, should be a minimum of 800$. Some corners you can cut, some you absolutely cannot. *indicates where being cheap won't hurt anything but looks/comfort.
- 450 for a reliable full metal/wood Chinese AK, mags, sling, battery & BBs (try high quality Bio BB's - gone off the face of the Earth in 90 days vs. 3+ years. What? Might as well start off with good habits)
- 40 for a pair of low-end ballistic goggles (the ones you bought at Walmart probably won't protect your eyes from 400FPS at point blank from .28's, don't take that chance)
*- 80 for a good pair of waterproof combat boots with ankle support (you'll thank them more often than any other piece of gear)
- 50 for a usable radio (you'll need it if you're serious about milsim, which is the direction you seem to be headed with the BDUs and militaria fascination)
*- 100 for a low-end load bearing vest to carry all of that + hydration (you'll find yourself quickly running out of pockets)
*- 200 for 2 sets of BDUs that won't fade after the first wash (one tan, one green so you can join 95% of games - Propper is a good brand if you can't find issue)
- 80 for odds and ends on your first game, field fee + gas + way too much jerky, energy drinks, dried fruit and trail mix bars + pizza afterwards.
Optional but as a fellow newb, I'd recommend them : flashlight, compass, gloves, shemagh and bug juice. Lots and lots of bug juice. Don't forget a change of clothes, a first aid kit, 2 extra pairs of socks and PLENTY of water.
Oh, and brush your teeth. Stay in school, eat plenty of fruits and veggies. Mark the calendar days until you turn 18, and welcome to ASC!
/maternal instinct
Now get off my lawn!
