But, in the beginning, consider folding and mailing using coffeehouse volunteers. This keeps the cost down. If experience is any guide, the US Post Office bulk mail rules will drive people batty, so lots of patience is needed. Tickets need to be designed, printed and sold. Ticket outlets will need to be identified that will sell the tickets for the coffeehouse.
Music stores are great outlets.
It would be good to find at least one that will take orders by credit card. Take orders by mail. Have the customers mail the ticket orders, along with a self-addressed and stamped envelope. Have an order form for tickets on the flyer. The tickets have the performance date, the artist, the venue address, phone number, web site URL, and the ticket price.