You can get sized at any reputable jeweler's. Once you are sized, however, you should compare prices for what you want in various jewelry stores around town, as well as using internet jewelry stores. My fiance and I found our best price for what we wanted at a site called Abazias. They were very helpful with us, and we learned a great deal about engagement rings and wedding rings on their website.
As far as the legalities of getting married go, you just have to go down to your county courthouse and fill out the paperwork for a marriage license.
