Hi Dragonlord,
As an ex full scale flight instructor, and currently an RC flight instructor, I would like to say a few things from my point of view. First, find an instructor that lands well.

Congratulations on you induction to the flying phase of RC. You are going to notice that most of what you have been doing with RC cars will not have much impact in the flying side. You are going to have to re-learn some things about batteries and engine tuning. You don't want to get too lean with the engine for air work.

You will start using BOTH thumbs (I hope) on the radio. Hopefully, your instructor will teach you coordinated flight techniques from the very beginning. With luck, he will start you off by having you learn to taxi, basic straight and level flight, and gentle turns while maintaining level flight. He probably won't let you land by yourself right away.

With the same amount of luck, he will not let you practice areobatic flight for a few lessons yet. He will want you to get used to the feel of the sticks while gently manipulating them, and not bouncing the sticks from stop to stop. Hopefully, you will be using a training cord.

Your instructor should take the time to explain a few basics about aerodynamics so you will understand why a plane responds the way it does. He should be VERY patient and tolerant. He should never repeatedly be hearing you say "I know, I know". Your instructor should understand that all work and no play gets boring quickly, and will sometimes give you break from basic training with fun flying.

You should be patient with your instructor, and not be upset if he wants to fly his own plane once or twice a day. When he does, watch what he does very closely.

A good instructor likes to teach, and therefore wants to teach. This makes for much better training for the student.

Your instructor should call you in advance if he can not be there on your normal flying day. As you should call him when you cannot be there. Basic courtesy is extremely important in this sport/hobby. Know without any doubt the safety rules and regulations for the location at which you fly. When in doubt, ask before doing. DO NOT EVER!!!! turn on your radio when anyone else is present without checking that your frequency is clear, and that it will not conflict with another.

Most of all, your instructor should want both of you to have as good a time as possible, and make the learning process fun. It is and can be. Flying RC is challenging and takes time and effort to become good at it, but it's worth it. My hats off to you for giving this side of RC a try, stick with it. Welcome aboard and enjoy.
Fly to Live, and Live to Fly!!
Silversurfer