as far as templates go, i dont think you're going to go very far unless they are really superior sites. because wordpress and other sites already offer superb, standard template sites
so you're better off offering custom site designs
and i think the first step to this business is picking up a good domain. think of the terms that you would want to be found under in a google search. then see how much those domains would sell for.
believe me, their worth it. and right now with the depressed markets, there are plenty of deals