As Raiyn and Rowan, start with it level. If you want to be more aggressive, tip in forward a bit. Some like it tipped back a bit.
You might want to take it to your LBS to see if they can help you get a good fit. They might do it for free, or you can offer to pay them "labor" for the time they spend with you. Even if they charge, it would be worth the money if you got a good fit.