I don't have the radio or know anything about the FlySky stuffs, but one channel will go into the aileron port and another into an auxilary port. From there you can set up the dual ailerons through the transmitter (check the manual, it should say how to do this and what channel to plug the second aileron servo into).
But if you aren't looking for advanced capabilities like flaperons or subtrims, then just plug the 2 servos into a y-harness, and plug the other end of the Y into the aileron port.
Yes you can do rolls. You mount the servos so that they are moving opposite of each other. You mount the arms to the outside and leads to the front or back depending on your set up and they will move opposite directions. Here is my bi-plane servos mounted in the wing for reference.
Vipertech is correct but to clarify I will say that YES both aileron servos will rotate in the same direction but they are mounted differently so that the output arm of the servos move in opposite directions.