All during the ollie, try and keep your shoulders and body level, as in don't lean toward the tail or nose of your skateboard too much. This will make the whole ollie easier, and it will make it easier to land on your skateboard after the ollie.
At the apex (top) of your jump, when you are as high in the air as you will go, you want to flatten out the skateboard underneath you. Make both feet level on the top of the skateboard.
