Other than "Type 3" you pretty much need more than your basement.  Plus they require a business license issued by your city for the type of business you're applying for.



Type 01 -
DEALER in firearms other than destructive devices.
(includes: rifles, shotguns, pistols, revolvers, gunsmith activities, and National
Firearms Act (NFA) weapons.)

18 U.S.C 923(a)(3)(B)

Fee:

$ 200.00 for the first three (3) years.
$   90.00 on renewal.
Application: ATF Form 7 (5310.12)

Type 02 -
PAWNBROKER in firearms other than destructive devices.
(includes: rifles, shotguns, pistols, revolvers, gunsmith activities, and National
Firearms Act (NFA) weapons.)

18 U.S.C 923(a)(3)(B)

Fee:

$ 200.00 for the first three (3) years.
$ 90.00 on renewal.
Application: ATF Form 7 (5310.12)


Type 03 -
COLLECTOR OF CURIOS AND RELICS.
(pertains exclusively to firearms classified as curios and relics, and it's purpose is to facilitate a personal collection. It is NOT a license to buy and sell curios and relics.

18 U.S.C 923(b)

Fee:

$ 30.00 for three (3) years.
Application: ATF Form 7 CR (5310.16)


Type 06 -
MANUFACTURER OF AMMUNITION FOR FIREARMS
other than ammunition for destructive devices or armor piercing ammunition.

18 U.S.C 923(a)(1)(C)

Fee:

$ 30.00 for three (3) years.
Application: ATF Form 7 (5310.12)


Type 07 -
MANUFACTURER OF FIREARMS other than destructive devices.

18 U.S.C 923(a)(1)(B)

Fee:

$ 150 for three (3) years.
Application: ATF Form 7 (5310.12)


Type 08 -
IMPORTER OF FIREARMS other than destructive devices
or AMMUNITION FOR FIREARMS other than destructive devices, or ammunition other than armor piercing ammunition.

NOTE: Importers of handguns and rifles MUST register with ATF under the provisions of the Arms Export Control Act. Contact the Firearms and Explosives Imports Branch at  (202) 927-8320 for further information on registration.

18 U.S.C 923(a)(2)(B)

Fee:

$ 150.00 for three (3) years.
Application: ATF Form 7 (5310.12)

Type 09 -
DEALER IN DESTRUCTIVE DEVICES.

18 U.S.C 923(a)(3)(A)

Fee:

$ 3,000.00 for three (3) years.
Application: ATF Form 7 (5310.12)


Type 10 -
MANUFACTURER OF DESTRUCTIVE DEVICES, AMMUNITION
FOR DESTRUCTIVE DEVICES OR ARMOR PIERCING AMMUNITION.

18 U.S.C 923(a)(1)(A)

Fee:

$ 3,000.00 for three (3) years.
Application: ATF Form 7 (5310.12)


Type 11 -
IMPORTER OF DESTRUCTIVE DEVICES, AMMUNITION FOR
DESTRUCTIVE DEVICES OR ARMOR PIERCING AMMUNITION.

18 U.S.C 923(a)(2)(A)

Fee:

$ 3,000.00 for three (3) years.
Application: ATF Form 7 (5310.12)