So this is your very first time dealing with fiberglass? . . .
You should definitely pick up a fiberglass bondo kit, other safety / respirator equipment im sure you'll find recommendations on sites dealing with glass. anyways with your fiberglass bondo kit (found at most places that sell automotive) you should practice and get a feel for it before you take on a huge project. use plastic spoons for molds and plugs for some practice etc. I find glass to be fairy easy to work with just messy and you go through alot of supplies. also there are alot of good books out there dealing with glass and can be very helpfull and they will have almost all the info you may need to get you to where you want to be with your project