My wife is from the UK and we were just married, how do we apply for her citizenship?

My wife and I were just married this last weekend. She was over to the US from the UK on a work visa. We went down to the courthouse and showed them our marriage license was notarized and they made it official. However I don't know what the next steps are. She has a work only SSN, but I don't know how she get a restriction free one or how she would become a citizen. Any help?