You can order parts and follow a tutorial made by the admin on this website by following this link:
http://www.societyofrobots.com/step_by_step_robot.shtmlYou should also try reading a bit more about robotics and basic electronics on the net before youre going to order some parts and put them all together.
And to control 2 servos with your pc, by USB for example.
First you need the servo controller (The circuit board itself) which the pulses from your computers code will go through, handled, then off to the servo to do as the code says.
An example is one of theese:
http://www.pololu.com/catalog/product/390It comes with a USB-B, I/O pins, a microcontroller, and offcourse power input and all of those things.