How do I ollie properly (read full description)?

I can ollie a tiny bit but not properly. In all the skate parks I get embarrased by it and I'd love to be able to do all the tricks. I've searched loads of places and i know to pop up and all that and if it doesn't work to try on a carpet and ive done them all but none seem to work. It's getting quite frustrating because it's a beginners trick and I've been skating for ages now. Please help!!!