When i try to do a moving ollie...my board slips out in front of me. help... i can do a stationary ollie.....?

I think that you are scared. Maybe you are kicking the board out of your feet(unconscionably), that happens all the time so don't worry about it, just practise and you'll get it perfect. Tip: Next time you learn a trick, try learning it at speed, don't learn stationary tricks. Remember, skateboarding is all about practise.