The Left Stick is Throttle and Rudder, The right Stick is Elevator and Ailerons. On the receiver, Airlerons are Channel #1, Elevator is #2 Throttle is #3 and Rudder is #4. That is the order for Mode 2 which is the set-up that most of use in the US. Some other parts od the world do things differently.

Good luck and keep asking questions.

Chuck