RE: which servo/receiver?
Small planes need small servos and receivers. Weight is very important in planes. If you put standard size servos on that plane it will be a dog, assuming it flies at all.
A 75 MHz transmitter should NEVER be used with an airplane. The FCC designates 75 MHz for surface use only. Planes MUST be on 72 MHz.
Transmitters can be use with single and dual conversion receivers.