The best position to keep your balance is looking to the front with your shoulders lined as the board. You should never look to the floor!

I mean don’t close your eyes or anything but you can look down at your front or back foot to see if you need to make any adjustments on your foot placement

To do straight ollie, where ever your head tilt, your shoulder straight with your deck, dont twist it coz it will impact to direction of ur deck. If you ollie to obstacle, take a look to your deck to check ur foot position and than take a look to the obstacle.

It is best for me to look down but slightly forward when i was learning

I try looking at the board