As far as making it wireless you should look into hobby controllers
http://www.futaba-rc.com/radios/futj63.html
I have that one and iv been pretty happy with it. It comes with a receiver and batterpack. If you dont know already the receiver will out put PWM (Pulse width modulation) that will control speed controllers that will controller your motors (you can also hook a servo up directy into the receiver)
Good Luck!