I what to finally make my firs robot, but I have one problem:
I found for my base nice RC car. Its perfect and also have power supply (6V 620mAh Ni-Cd ) with charger. Also servo in front. So its perfect, but it have very powerfull DC motor... Is can use more then 4 Amps of current (if wheels are blocked). If car is lifted and wheels are spinning free it uses about 0,4A. Then starts a moment use about 1 A. All my tests were with my 6V Ni-Cd battery.