New to Robotics - getting started?

Damn, I was afraid ripping the original board out might not have been a good idea. I don't think it's been damaged, but it won't be able to be powered by the Jeep's original batteries anymore, and it can't even reattach itself to the battery compartment because I filed that down to be nice and flat for the Uno. Anyway, here are the most high-res pictures I could get of the board, front and back. Two questions:

  1. If I use the original board from the Jeep to control the motors, do I not need a Motor Shield anymore?
  2. Will I still be able to power the original board with another type of battery?

And I don't know what an IC is, but on the back of the board it says 'RX-2022B(SMD)'.

Front of the board
Front of the board
Back of the board