Will you be establishing a trust, or the finger print/signature option?
If a trust, establish your trust, and fund it to make it effective.
Go to the ATF web site and open an account with a user name and password.
E-file your form one application (this was the trickiest part)
You will be attaching your trust when you submit
Wait (mine was a few days past 100)
When you get your stamp, ENGRAVE your lower with the name of your trust, city and state. Every gun I have ever bought had the manufactures name, city and state. Your trust is the manufacturer since you are "building".
I followed these steps, and didn't have any issues.