Actually the forms are three, and easy to fill out. They are the ATF form 4 (to buy) or the ATF form 1 (to make), form 5330.20 and two finger print cards. The forms can be downloaded here;
http://www.atf.gov/content/library/firearms-forms If you want to e-file, then a single form is filled out and a pdf of the trust is attached and submitted.
The wait is long though; 5 months for e-file and 9-10 for paper forms.