Maybe start with 1 to 3 areas of emphasis,
But then as you get rolling, I mean, if someone is moving in a generally positive direction, I think it's fine to add additional areas. And really, if you can recruit as few as five volunteers who do at least one or two things a week to help the projects along, that is not at all a bad beginning for a group. And heck, might even make some progress before you get up to five.
I live in Houston, Texas, but if I lived in Liverpool, I'd be happy to attend a couple of meetings and see if I fit in!