am building a robot with my son am using drill motors x2 left and right like tank style and can not seem to find a suitable radio i have been told 2.4ghz.i need a controller so when both sticks pushed forward both motors go forward same with reverse and steering done by the two sticks but am getting confused looking at spektrum 5ex or i see everyone uses 6001 and what is mode 1 and mode 2 please can someone help??????????????