Well, at this point - welcome to Sheridan! Sorry I don't check this forum frequently.
There are a couple homeschooling networks, Ina isn't school-aged and we haven't decided for certain whether we'll homeschool or not yet anyway so am not familiar with what the groups are like ....
There are also a couple different mom's clubs. MOPs and MOMs. I haven't joined either one ... dh and I are a bit introverted and it's not as high a priority as I suppose it should be.
The Health Food store is the Health Nut. There are a couple others which also have some. Sheridan Stationery (downtown bookstore) has a booklet about all the local foods available (if you're interested in eating locally grown foods). There's a Farmer's Market on Thursdays (4:30 to 6pm?) at the park between the Senior Center and the Library .... It's pretty small but a start. There's also one on Saturday mornings at Landon's nursery (out by the college).
There's a lot to do here outdoors - the Big Horns are wonderful.
In terms of homebirth - assisted homebirths are not legal in WY. That said, I have heard that there are midwives in SD and MT (and CO) who will work with WY moms, I don't know how many want the mothers to cross state lines to birth. Bummer, I know. There are two OBs here; Dr. Gill is married to a (not practicing) CNM. Dr. Scott (the one I see) has been very supportive of NCB (and 'extended' bf) etc. with me. So I think if you have to use an OB, you have a relatively good selection for a community of this size. The cost of birth at Sheridan Memorial is astronomical though.
Either Ped would probably be good, as well. I'd recommend meeting with both and deciding. We chose Dr. Bowers who is anti-circ and very supportive of bf (helped me with an elimination diet and supply issues).
We are headed out of town for a long trip after next week, and won't be back 'til mid-October (well, in and out) - dh is self-employed so we have a pretty flexible schedule and take advantage of that.