Michael, would pay to talk to Al Cook from Planet Surf he sells windsurfing gear and may have some good second hand gear, he would certainly set you in the right direction.
Damo is right talk to someone who knows as there's plenty sh.t gear around at rock bottom prices but not worth buying.
You'll find Al's details and others on the link below
www.windsurfing.org/tas.htmAlso hook up with the Launy guys who sail at Low Head they'll help you get started