If you haven't already I'd focus first on talking to a bunch of people face to face. It's much quicker to receive feedback that way and iterate your pitch on the fly. Once you feel like you've got a good grasp of what people are looking for, and how to best communicate what you have to offer, only then would I move to more scalable yet less personal media such as email. Early on it's all about developing an understanding. Growing a customer base then becomes much much easier.
Perhaps you've already done this type of research though. I couldn't tell from your question so figured I'd throw it in.
@jillbinder makes some excellent suggestions.
If you haven't already I'd focus first on talking to a bunch of people face to face. It's much quicker to receive feedback that way and iterate your pitch on the fly. Once you feel like you've got a good grasp of what people are looking for, and how to best communicate what you have to offer, only then would I move to more scalable yet less personal media such as email. Early on it's all about developing an understanding. Growing a customer base then becomes much much easier.
Perhaps you've already done this type of research though. I couldn't tell from your question so figured I'd throw it in.