Dave Gerr's book "The Nature of Boats" gives rules of thumb for mast sections in Chapter 39. The formulas are 'old school', and fairly conservative. They'll give you a mast and rigging heavier than necessary.
To get more precise you need to know the righting moment of your boat. If you do, Chapter 11 of "Principles of Yacht Design" by Lars Larsson & Rolf Eliasson has the calculations.
Maybe I'll start an argument here by suggesting that a heavier mast reduces static stability but increases dynamic stability of a boat.
Good luck,
Tim