When I filed for mine, which was just granted a couple of weeks ago, I used the Wireless Infrastructure Association since I was applying for fixed location channels as well. They definitely helped me with my eligibility statement etc. I also made sure to have my trade name used in the application registered with my state and I made sure to have an EIN from the IRS. I also set up a FRN for my business because I want the business to be separate from my personal licenses. Maybe this is not all necessary, but I’d heard about hams having a hard time getting licenses, especially for itinerates, when using their personal FRN. I guess some people are applying for commercial licenses just to have some private channels to play with, and not for any actual commercial purposes… In the words of The Offspring “You Gotta Keep ‘Em Separated”…
-B