Find a big, empty area to drive in.
Learn the limits of the vehicle.
Learn the limits of yourself as a driver.
Remember that each vehicle you drive is different; They are machines, and machines can be strange.
Know that you WILL start off as a poor driver, and experience behind the wheel is the only thing that will change that.
Edit: Also, bear in mind; operation of a vehicle is completely COMPLETELY different than operating in a structured system (driving on the road). It is much much harder to do, so learn from the start defensive driving techniques and such.