Have you done any rolls or flips before?
Be sure that the boat drivers know what they are doing. For the best v-wake, you want the boats going almost uncomfortably close. The wake has a large dip right in front of it. You want to sort of pre-hop into that dip, then pin it.
For the flip, do your pre-hop and squat down to unweight the front of the ski.
As the boat leaves the water, throw your head back violently and pull on the pole. If you can, stand up and arch your back.