AS Neu_Racer said you can get a 9, 10, 12 or 14 channel Tx/Rx on 2.4 ghz that will serve you well.

As for controlling them from the computer I am unsure if this is possible. The JR and Spektrum brand radios can have their firmware updated via the factory, so data can be sent to the TX and RX but I dont know if this data can be used to control the TX or RX while operating. I suspect it is possible as these radio can also be used for flight simulators through a data cable connected to the computer.

I would suggest you might be better off pointing your questions towards one of the many robotic forums around the world as this is their field of expertise.