How much should I charge a friend of a friend for designing a wedding invitation package?

The package will probably include save the dates, invites, response cards, envelopes, placecards and thank you cards. I expect that I will do a lot of handwork on the save the dates, but I’ll probably design all of the other pieces and send them out for printing and finishing. I am a professional designer, but I haven’t been married or done freelance work like this for a long time, so I have no idea what people expect to pay. Any advice would help. Thanks!