But, a quick warning! If you learn to ollie while standing still, you can develop some bad habits. Some skaters end up turning in the air a little, and not landing straight. You might not even notice until you try to ollie while rolling. So, if you practice while standing still, I highly recommend also practicing while rolling. Maybe only practice in one spot for a few days - maybe a week or two - and then give the rolling ollie a shot. That way, if you are developing bad habits, you can shake them off before they really mess you up.
To get higher ollies, I would suggesting resting your back foot on the very end of the tail and the front foot in the middle of the deck to allow for more slide. Popping as hard as you can and catching your board in the groove of the nose with you ankle practically resting in the groove will level the board out in the air. after this initial movement slide you feet back to the bolts on the tail and nose to ensure a clean landing.