"1) Can I base A ROBOT On the 8052 MCU's ??
is it powerful enugh ?? (I Think 8052 is ok)"

I guess for tasks like simple navigation and motor control, 8052s would be enough. For more complex tasks you would probably need a more powerful central processor and a number of less-powerful distributed microcontrollers to handle more specialized tasks.

The way I'd do it is let the master processors make the high level decision (e.g. move from point A to point B) and send a message to the slave processors that actually interact with the motors and sensors. Its extremely difficult to have one processor manage all aspects of a task.

"2) where/how should I Start ? Books or WEB ??"

Web. Long live Google.

"3) Any TIPS For Beginner ??"

If you know embedded systems, I'd say the first thing you would need to learn is motor control! Actuators can be electrical, hydraulic or pneumatic, but for most people, the first option is the only feasible one.
Knowledge about Control Systems would also prove highly useful.

<disclaimer>I probably have no more background in robotics than you and the above is nothing more than an educated (?) guess.</disclaimer>

By the way, what sort of robot are you aiming at (or would like to be) building?

kundi