To get started you only need a willingness to problem solve. Technical expertise is NOT required.
You could apply to your local council for a small grant to cover the costs of a perhaps a couple of tablets and cases and initial connectivity charges, if required. Or ask for the free use of a building.
You could advertise for local volunteers to support people getting online for the first time. Can your Parish Council or a local community group help?
Maybe ask for donations of old tech from your community, being firm in not accepting tech that will not be useful.
Ensure volunteers avoid learning passwords and financial and other personal details.
Be reliable. Establish a regular meeting time, weekly or fortnightly.
Tips
If choosing a data package, check data coverage in your area first
A Saumsung Galaxy Tab A is a good tablet for the beginner
Within the group, familiarity across the range of platforms (Apple, Android and Windows) is helpful.