Foot placement is vital for an Ollie. You need to be comfortable on your board and know if your goofy or regular. If your regular you have your left foot forward and your right foot back. When your goofy (like me) your right foot forward and your left foot back.
Step 2: Pop The Tail
Now you need to pop the tail over and over until your comfortable
Step 3: Slide That Foot
This is what makes it happen it makes the board go up and straighten out
Step 4: Jump
This is what makes the board go up
Step 5: Having Trouble
If you have trouble with balance get skatertrainers and be better with your Ollie.