Not Kevin, but for Kevin or someone else to answer your question, they will need more information.
1. What is your skill level? Water starts, planing jibes, racing?
2. Do you have a board and if so, what is it?
3. What type of windsurfing have you been doing? Freeride, bump and jump, slalom, wave, freestyle, speed, formula?
4. What sails do you have and what are their sizes?
5. What type of sailing will you be doing. See #3 above
Get back to Kevin with the above information and he may be able to help.