You will need an 01 FFL (Dealer). Do not waste money on any kit. You WILL need a business license, and all of the other stuff to run a business (sales tax in your area? Place to do business that meets ZONING?) BEFORE the ATF will grant you a license. You do not have to have a storefront IF zoning will alllow a home based business. You WILL need to designate a business location, and hours of operation, and must intend to "engage in the business" of buying and selling guns- not just to get guns for self. If number of sales is too low, BATFE will not renew. DO search for past threads on this- has been discussed here several times.
What we have here is... failure- to communicate.