Some decent advice so far. I will offer a bit that will save your plane, and may save your life. Get an instructor! Without one, I can pretty much guarantee that you'll crash that plane within about 20 seconds after taking off. Then your parents will kill you for wasting their money.
Ask those guys from the fly in if anyone can teach you. You'll have a lot more fun in the long run.
If you're buying new engine, I'd suggest a 46. Doesn't really matter if it's an OS (LA or FX), Tower Hobbies, or Thunder Tiger, but you'll appreciate the extra power, especially once your ready to move to your next plane.
Okay battery packs. The transmitter (Tx) and receiver (Rx) packs that come with the radio will power the Rx for about an hour, and the Tx for some longer time. Be sure to charge the packs overnight before EVERY trip to the field. (Doesn't matter if you were there yesterday and didn't fly, get in the habit.) You should also think about getting an expanded scale voltmeter so you can check them. Might save your plane, and they're only about $15.
Any trainer is capable of more aerobatics than most people realize. A decent pilot can get a trainer to loop, barrel roll, stall turn, wing over, immelman, cuban eights, split S's, rolling circle, and even a bit of knife edge. Most newbies just get impatient for their next plane, which has to be "aerobatic".
Flight equipment. At a minimum, I would get a self contained glow igniter and charger, expanded scale voltmeter, manual fuel pump, fuel (1 gallon minimum), a couple extra props and a chicken stick. If there's any way you can do it, also get a starter and 12 volt battery. I really prefer one with a self contained 12 volt battery, so I don't have wires hanging around the prop.
With a self contained starter and glow igniter, you also do not need a power panel.
You will want some type of flight box to carry all this stuff, but don't pay the high cost for a "real" flight box from Tower. Go to a local hardware store and buy a large plastic tool box. Mine carries everything I've listed, plus props, a tachometer, a quick peak field charger, paper towels and cleaner, glow plugs and wrenches, pliers and screw drivers, etc, etc.... Oh yeah, my transmitter fits in there too, and when it's closed I use it as a seat. Best thing? It cost me about $15.
Anyway, good luck and have fun. (It's the only reason to do this!)
Dennis-