I started one a couple of years ago. Originally, I tried to organize a board, and then look for space. The board didn't work because, as you probably already know, homeschooling parents are pretty determined individuals and it was hard to get a consensus on what everyone wanted. I wanted a *place* where classes could be held, kids could play together, and traditional holiday parties could happen (valentines day in particular - I always loved that one!) but others were looking more for an organized co-op.
In the end, I just decided to take it on solo. It's a lot of work - but my kids did love it. At first we rented space at a senior center, but they had a different idea of what home"schooling" meant
: . Then we rented space from a church. It was an awesome space, but it was also challenging because the needs of a church don't always align with the needs of children, iykwim.
I have since moved out of the area, and a loose board was set up to run it. It's currently struggling becuase there's no one person necessarily wanting to be in charge.
If I were to do it over, I would look at running it almost for profit. In other words, I would build in a reasonable $ for me to organize it and then find outside resources for classes, etc. There's a belief that homeschoolers don't have $$ but if you think about it, most do, it's just a matter of priorities, so it needs to be of high value/quality to get buy in. I think getting compensated would have offset the level of burn-out that I felt when I left.
Ideally, I would have found a parks & rec dept that would buy into meeting the needs of homeschoolers by offering a drop in sort of thing, but it was a tough sell. I think we are terribly unrepresented as far as public support.
Also, I understand that it is possible to get group insurance for homeschoolers through HSLDA, but don't know all of the details.