Pentax 67 and Meade 12"

i am a new member and have just received my scope. It is the 12" Meade with a fork mount. I also a Pentax 67 medium format camera. I would like to take astrophotgraphs. Has anyone used this combination. I am looking for some basic advice - I am sorry if this is too basic a question for the members of the forum. Thank you, Paul Hart