Hi,
If you are new to motors, sensors, mechanics, and microcontrollers as well then, I would suggest that you tackle one field at a time.
1. get the mechanics right first. attach motors to it and see if it moves directly off the battery. see if it can turn.
2. read about H-bridge. make one or buy a h-bridge chip.
3. Read about microcontrollers. Beware that it might take months to get up to speed with them, you might end up building a programmer alone for a month. there are SO many choices to make. Good thing is that if you devote some time to reading around in this forum, you will one day get past it.
Thanks & Regards,
Pradeep