Hey Ed, The best way is to start in the water like a wakeboard. A swim deck start is not legal in CA. If you are comfortable surfing then you can pop up as on a wave after being pulled into the wake with a rope.
in the water with the board parallel to the water and with the heels of your feet on the top of the board in the general position that you will be riding in. When the boat starts to accelerate, your board will then dig into the water and be perpendicular and from there its just like getting up on a wakeboard.
You can also get up just like you would on a surf board but i find that method a little tougher.