After mastering the beginning skills, there is a very complete sequence of intermediate and advanced lessons to keep the student progressing. If you can not locate that book, read on. The more you know about windsurfing, the faster you will progress. If you picked a good windsurfing school, they will provide you with an appropriate board to learn on. Pick a board with enough flotation to allow you to stand and balance easily.
Kids can use shorter boards.
The amount of flotation you need depends mostly on your weight. For example, if you are under 160 lb. If you are between 160 lb. Well, Bud is on a 5.7 and he seems to be flying. I don't know, a 5.2 might be perfect.