Watch alot of videos and try to mimic them. But....
The most important thing is staying forward. Constant pressure on your boots. You should try to get whole body forward as much as possible while still standing up. To do this practice 'reaching' with your poles for the back of every mogul as you ski. Keep your body square with your hands out in front. Use your wrists to control your pole plants.
Second, make sure to keep your center of mass going down the mountain. From the waist up you shouldn't move. Keep your shoulders chest down the fall line, let your lower body make the turns. You may be afraid of going to fast at first but you will get the hang of it.
Third, absorbing the moguls is key, it keeps your knees alive, your upper body calm, and controls your speed. For controling your speed, absorb the front of the mogul to slow down, or push down the backside of the mogul to speed up.
Lastly, practice alot. It takes along time to get to be a good bump skier. Try to find something not too steep with a good line that you can practice on. Also, pretend you are skiing bumps on groomed stuff, you will look like a fool, but you will get the feeling eventually.