RE: help with engine
Hi.
I agree with Scalebuff in that you should go to a local hobby shop, get some Cox fuel, glow clip and battery. Have them look over the engine while you're there and ask for helpful feedback. Then mount the engine on a some sort of test stand (you can make one out of wood - just make sure the prop clears everything). The folks at the hobby shop can probably give you pionters on how to get it started (rather than have us explain it over the net). BE CAREFUL!! GLOW ENGINES ARE POWERFUL AND CAN SERIOUSLY HURT YOUR FINGERS, ETC.!!
If you get the engine running ok, then worry about getting a plane. Your best bet would be a control line plane. When I was your age, that's all I flew and it was fun! You can get a wood control line plane kit fairly cheap. An .049 on a wood plane will be fast! I had one, so I know!
Gook Luck!