What does a template have to do with how to model the boat? Do you know what a template is in SU?
The simple fact is, a shape like a boat hull–a compound curved surface–is simply too advanced for a first project. You need to build up some experience working with simpler shapes first–spend some time just making basic objects that will give you a chance to become familiar with the various tools. Go through as many tutorial videos as you can stand to watch. This is more or less how I proceeded to learn the program, and when I got around to making my first boat hull, I didn’t have to ask anyone how to do it–I already knew, or at least had a pretty good idea of what I had to do. And for a fact, templates played no part.
What you really need is a series of cross-sections through the hull.