Design for electrical vehicle

Hello,
I want to build a vehicle with electric power, this vehicle should run in farm field (uneven surface with mud on it). I expect
1. Concept of electric vehicles
2. Which motor can be used
3. Which battery should be used (how much voltage, current and power these motor will consume)
4. How to change this system
5. How to turn left,or right (how to achieve navigation)
6. How much will be cost for this project

I prefer some one from india as when I want to build prototype of it the components should be available in india.