Do they have email? Then you can do what I do, I send out little devotionals to people, something small and little to start with, say about once a week to them, if they like it and say so, you can then send them something more in-depth. Breaking the ice so to speak, if they don't want it and say so, take them off your peoples list, until they are ready.
This way you will be planting the seeds, the rest will be up to God, as He does the increase.
1Co 3:6 I have planted, Apollos watered; but God gave the increase.