To give the hull a little crunch resistance, I would use two layers of heavy cloth followed by a final layer of 3/4 ounce cloth.

I was once in your shoes having never done fiberglassing. I was afraid to try it since I figured I would botch the job. Once a friend supervised my first glass job, I was left wondering what I had been afraid of! It really is a fairly easy process.

Follow Umi's advice in the above post and you stand a great chance of success.

West System epoxy is a great choice for the resin. Z-Poxy is also one that works very well. You want to choose an epoxy that is made for fiberglassing because they tend to be thinner when mixed than just a regular epoxy glue.

Many folks will advise thinning the epoxy with alcohol, usually denatured alcohol, but, in my experience, you run a risk of the epoxy curing to a rubbery like consistency instead of the hard surface you need. Both the West System and the Z-Poxy are already thin enough to do the job.

Two coats of resin over the final cloth layer (you must sand the gloss off the first coat of epoxy before applying the second coat) will fill the weave and then the entire hull can be sanded down to a nice smooth surface.