Melissa, our group has been going for a while now, for the LONGEST time, it was just three of us! It didn't worry us, our kids got into a really good relationship with each other. So just take it slow.
When we started out we went to a community hall, but decided it was nicer to go to each other's houses, parks etc. We are now going to find a home at a community garden. At the begining we put up lots of posters with those rip off strips with our phone numbers on them and we dropped off lots of fliers to where ever we could think of. We drew up a media schedule LOL. We were in the local paper and the local radio. I think if we hadn't have done all those things, it would still have worked our really well

Our group has taken off lately because we met a doula and she refers her clients to us! As for toys, we made quite a lot of toys ourselves, but find we might need to do a separate craft circle instead of combining the two.
I built a website too

This has been handy to let everyone know what's happening everyweek.
HTH
Freya