What level are you doing this on- secondary/undergrad/hons? There are easier surfaces than sails which are very 3 dimensional, in that you have the cross section of the foil then there is twist, flex, different aoa etc. Something easier would be fins which there is stacks of good info on, not that im trying to dissuade you.
I'm sure barry had a bit to say on early mauisails forum about sail design and you can start working your way through the hundreds of good links on google, hmm what was life like again before google
