You don't really need a computer radio. Just buy an extra servo and a "Y" adapter. $10 for the servo, maybe $7 for the "Y".

Connect the two aileron servos to the ends of the "Y", then plug the "Y" into the aileron channel on the receiver.

For Flaperons you'll need a computer radio. The Futaba 6EXA is a good, inexpensive, first computer radio and you can set up Flaprons pretty esily.

Good luck, and welcome to RCU.
Dennis-