Carlos: I think what Sean’s saying is that your target market is custom written email or copy specific to each individual customer. Very different from the usual internet marketing “done for you” series that are sold to lots of people and then they’re left to tweak them (or usually not) to their own style.
With regard to who your own target market is, maybe it’s worth asking yourself what you’d recommend if you came to you as a client. It might take a few Q&A sessions with yourself to get to that stage. Or it could be phone a friend time and get them to role play being you to make the process easier.