Zildjan.
One thing nobody has mentioned about being at a flying field/instructor.
You might be able to teach yourself to fly, but what about the other 80% of the hobby. The planes spend minutes in the air, there is generally an equal or greater amount of time working with them.
Like trim. I would bet that your typhoon is NOT trimmed correctly. It should fly straight and level with the trim adjustments on the transmitter centered. If you are flying with the trim on the TX set to compensate for the planes tendancies, you are getting into a really bad habit. Planes should be mechanically trimmed, not electronically. And to that point, a plane will rarely stay in trim forever (especially foamies) and will probably need to be adjusted every 10 or so flights to keep them in. On that typhoon, it probably wont hurt much being a little out of trim, but on bigger planes, especailly if you do any kind of performance flying, electronic trim = bad.
What about your flying procedures. That typhoon blade hurts like hell. Ask me how i know (
). Basically, was helping a newer person at the LHS fly it and it bumped the stick while i was holding it (my fault, i shouldnt have had it on yet), got 4 pretty decent cuts (no stiches, but they could have been justified for it). Things like that, lessons that you need to learn...you can learn them 2 ways. From someone else's mistakes, or from your own.
Plus, in the end, you will want to go to a field. No field is going to just let you in the air with foamie experience. You will have to be cleared and you will be treated like a new pilot. Very little translates from electric to glow...again, moving the sticks is just 10% of what your doing in the air. You may as well find your field and go to it, see if someone has a trainer to train you on, some fields do.
I say you will probably end up at a field for a couple of reasons. The first, you already mentioned, you want bigger planes. Even if you could get a 40 sized electric, flying it at a public park is dumb, too much risk. The second reason, is that you will learn that the best part of the hobby is the people. When you pull some crazy move, its more rewarding to have someone else see it. When you crash, its better to have someone talk you up right then.
And as far as the engines. If you see guys messing with their motors everyday...then they have issues. Bad motor/bad pilot/bad fuel. Probably the first or more likely the second. If you have to touch your motor everyday, then there is something wrong. I have a Saito .91, and OS 46, and a TT 39 (in my heli). I might touch one needle among the 3 all sumer long. You get is close, and leave it. It will never be perfect every day, and trying in vein to keep it perfect is the sign of someone who doesnt really know what they are doing. There are exceptions to this, pattern or extreme speed guys have a reason to keep their motor at 100%, but sport flying...not neccessary, and is often worse. A guy at my field bought a plane from someone, a plane that i had seen fly fine for a year...never seen it deadstick...first day out with it, hes messing with the needles, dead-stick on takeoff, went from a perfectly good warbird to toothpicks really quick. Stupid move.
Im not telling you to go glow, do what you want. But think ahead a little. Your 15 now, you will be able to drive soon, until then get a ride to the field...and a ride home. Hell, you might be lucky and be near another member and ride with them while you need to. Just dont close doors over stubburness...