Staying on a plane

[jim]

I am working on my waterstarts. I usually can get up on a plane with the first dive I make of the kite but then I fall off the plane because I cant seem to keep the kite powered up. Watching people who know what they are doing it seems like the kite dives to get you out of the water, and then it is just held somewhat stationary at a certain angle and the rider is locked in and planing.
I am not sure when to sheet in or out to keep the kite powered up, or when to keep diving it to keep power. Any help would be great. Thanks.