If your invitation says “and Guest,” then yes, if not, we would prefer if it was just you.
No, the drive between any of the venues is approximately 20 minutes. Uber is always a great option- we think they will come out to the reception site, but you may want to double check to be sure.
It's really up to you. The ceremony will be held inside a church, and the reception will be outside under a covered pavilion. The area around the pavilion is grassy, so be mindful of shoes. Also, pay attention to the weather, and come prepared with jackets/coats if needed.
Yes- Amazon, Bed, Bath, and Beyond, Target and ciderr.com. Links to these sites are under the "Registry" tab. Click on "Other Registries" and you should be good.