The first step in conducting a needs assessment to see the needs and interests of your parish members. There is a Faith Community Nursing course that provides tons of info, some are online some are in person. I also recommend these books
Hickman, J. (2011). Fast facts for the faith community nurse implementing fcn/parish nursing in a nutshell. Springer
Patterson, D. (2003). The essentail parish nurse abcs for congregational health ministry. The Pilgrim Press.
There are others as well Fast Facts has sample needs assessments as well as frameworks...