I used a website called fflkit.com. Sure, the ATF has all the info, but this site walks you through all the steps. I operate out of my house. When the ATF inspector showed up for my inspection, she (a hottie, by the way!) was impressed that I had everything in order. I had HOA approval, a letter from local Law Enforcement, business licence, naming rights for my company, etc. If memory serves, the cost was around $30-40. Probably the best investment I made. You want to start out on the right foot with the ATF. Hassling them would be like poking a grizzly without a cage!