mera pehla robot

Hey! everyone

I am now to build my first robot..
but as usual no theory known in beginning..
So, from where should I start??
Jst rolling wheels with battery or I should work with pcb??
A earnest request I would like to make is that suggest something, which can make my robo a practically useful thing.. Not just a toy to be played with.

Thanks
Shubham

Try David Cook's Robot Room: Robotics, Circuits, and Machining for some ideas.

Do you what one to follow a line or one to bring you a drink? Thay are vary differant. Try a line follower for now.
You should post in the robot form.
Andy