I am not an FFL holder, nor do I claim to be. However, the drill goes something like this: first obtain a Type 01 FFL. Once approved, file the paperwork and pay for an S.O.T. Once the check is cashed, you are an S.O.T. There are different types of FFL holders and different types of S.O.T.s. The S.O.T. has to be paid up yearly and the FFL needs to be renewed every four years.
At any rate, that's only roughly how things work. There are plenty of S.O.T.s on the AR15 board (David_Hineline is an S.O.T. out of the Omaha, Nebraska area and is one of the moderators of the full auto forum on the AR15 board) who can get very specific with you. I'd suggest reposting over there.