Judy - what you can do is send an e-mail with a link to your website and your "EPK".   Some people do not like to receive attachments to their e-mails and can have blockers that will prevent it from reaching them. If you send a link, and if they are interested, they will respond.

Unfortunately what you will discover is that everyone is different. Some people won't visit your site, nor will they want a file attachment - they will insist on having a physical copy sent to them.

I do think an e-mail will help determine what they want. Ask a question or two. Having a link is a direct and easy way to have them sample your material, and I think most people have become computer literate and won't complain. The handful of "last century" stick-in-the-muds are dwindling.

Also, never call yourself a "poor" folksinger. If you sing folk songs, you can't expect to drive a Porsche!!   I've never seen any of the "big" names drive up to concerts in BMW's either!   

If you wish to take the step from "folksinger" to "professional folk singer", then you need to consider the investment. If I wished to work as a lawyer I would need money for a good suit and a briefcase.   If you are trying to get bookings outside of your area, then consider the cost of Sonicbids and a trip to a Folk Alliance conference.

On the other hand, you might be happy (and rightfully so) to keep it as a "hobby" and enjoy bookings in your own neck of the woods. In that case, your own website and "home-made" EPK to your potential clients.   You would not want to waste money on fancier kits if you know your market.