Basic problem in Robotics

hi im new to robotics. i have knowledge in programming.
i want to hook up my laptop on top of four wheels and make it drive from point A to point B.
how do i make the computer control the mobile.i.e brake and run,turn.
which software should i use?
do i have to build my own software?
what type of sensors should i use?
thank you so much any helpful comment is much apriciated.