Summarize the following:
Once you are comfortable with the basic mechanics of the kite, it is time to get in the water. You'll do this without a board at first, and in wind conditions that are below 20 knots. Be sure that you are in a relatively clear area of the water. You don't want anyone within 100 yards. Practice the same flying exercises that you did while on land. You will want to make sure that the area downwind of you is clear. That is probably where you will end up! Whilst the kite is in the air, practice dragging yourself back and forth using the wind through the water. You'll be "kite surfing" without a surf board. Do this until you are comfortable controlling your kite.This is essential to safety so make sure you are practiced with it before progressing further. You'll need to know how to do this if you ever have to retrieve a lost board. Whilst your kite is in the air, sit back in the water supported by your harness. Then put your feet onto the board and float to get used to the feeling. When ready, pull yourself up into a standing position. Keep your center of gravity low to maintain your balance before attempting to steer or surf.  Don't stand up too fast or aggressively - you might tip over the other way! During the offseason you can practice your "board skills" on a skateboard. Turning the kite will be harder now that you are on your board. Push the steering bar forward to bring the kite over your head. This will slow you down, allowing you to more easily move the kite to the other side of the wind window and start in the opposite direction. Rome wasn't built in a day, and kite surfing is a hobby that takes a long time to master. The more time you are on a board with a kite in the air, the more your skills will improve. Start slow at first and always stay safe.

Summary:
Get yourself wet. Practice body dragging. Get on your board. Practice changing direction. Practice practice practice.