The Storytellers Hideaway Farm is where the wedding will take place; it is located about 1 mile down from the museum. The museum looks like a large general store (it was once a general store, in fact) that will be on your left. Continue on down the road and the entrance to the farm will be on your right. If you get mixed-up, don't worry - there will be a sign at the museum letting you know to continue on down to the farm.
Unfortunately not. Make travel arrangements with your fellow guests, or try using Uber/Lyft (thought getting one to pick you up from the venue might not be possible).