up is much better than out.
seek a strong and short approach pop with a solid and in-control body position.
a strong body position has your knees over your toes and your hips under your shoulders.
progressive edge allows you to build an edge into the wake.
standing tall allows you to assert into the wake.
loading the line provides you pop off the wake.
keeping the handle close to your lead hip allows you to be in control while in the air.
get yourself a good instructional dvd.
get some lessons from a pro at a camp.
try to ride with some folks that know what they are doing.
note, even though I don't do it perfectly, I think my advice is sound.