Hi Link
Seawind is an OK boat.
If you have built an airfix kit you can do this.
You will also need to buy a sail servo. These are more powerful than a standard servo. The instruction will tell you what thype of sevo you need, sail winch or sail arm.
If you google you will find lots of stuff on the seawind. Including build logs, hints and tips on how to improve or modify the boat, and more
Sailing is good fun and relaxing. Enjoy
:)