Is it readable for you guys?
Ja hoor. Prima 
How can I send commands to my laptop via usb and vice versa?
Lots of possibilities there:
- serial communication using the USB connection. There are various libraries for this. Check the Playground.
- I2C
- wireless (RF @ 433 MHz, XBee, Bluetooth)
I think the final choice depends on a number of criteria, for example: how mobile you want the robot to be (i.e.: tethered to a computer or not), how reliable the communication between the robot and its hub should be (tethered is more reliable than 433 MHz, XBee is more reliable than RF @ 433 MHz), how much money you can afford to spend (BT is expensive).
Good luck, have fun & keep us posted of the results