The only thing you have to do is:
1.Place your weakest leg on the board and try to keep your balance.
2.With your strongest leg, push off.
3.Once the board has start rolling, place both legs on the board. Try to keep balance.
4.When the board starts to slow down, repeat 2 and 3
If you're barely beginning to skate I recommend you to keep skating till you know how to keep your balance and know how to go fast.