If you are only going to sell guns its hard to make any money, I sold maybe 40 guns a day from three stores, with only a 10 to 20 percent markup, you make more on consignment guns because you have no money involved in their purchase just floor space. You will make more money from the accessories , scops ammo, rings, reloading equipment, stocks, etc... It really pays to have a gunsmith in the shop but it does bring another layer of cost to the picture.
Get some business classes they are very important.
If you want a bank to loan money you will need a very good business plan and some of your own money to put up. Banks and the SBA are good sources for money, also look into your area for government help, many locations have incubator programs where you can get a reduced rent rate and other help.
Select your location carefully, traffic is important but high traffic areas cost more to rent, shelving is expensive unless you can buy used, good signage is also important. Advertisement is expensive, unless you have lots of money stay away from TV, get a good yellow page ad, and use the local paper to push sales, Penny Saver adds are cheap, advertise a few guns and accessories each week, Radio is a good way to get out the word but pick your air times to get maximum coverage, 6-8 am, 4-6 pm are prime times, that and the yellow page ad will work the best. A sign on your auto is also a good cheap ad. I sponsored a sports report for one of the talk radio stations in my area cost me around $100 a week and was well worth the money. I had several thousand targets made up with my shops name and phone number at the bottom, I gave hundreds to the local ranges and I have a stack at the check out counter I charge .50 each for them but I always give several to customers who buy $20.00 worth of merchandise. Sponsor gun safety courses, and join chamber of commence and other business related groups, its a good source of info and very good place to network.
Know your customers, don't carry $1500 dollar shotguns if you don't have the clientèle to buy them its a wast of your capital, same goes with black guns. I don't carry any cheap Saturday night specials, Make sure your customers know you will special order what you don't carry but always get half up front.
Lots of light if the customer can't see it he won't buy it.
Keep thing together, shotguns near decoys, and shotgun ammo, scopes near rifles, etc... We were really getting into the Cowboy action trade very good money their.
Insurance is a must over at
http://thegunsmiths.com/phpBB2/viewforum.php?f=31&sid=83a7539bee92cbd16af88b9084f65899 (you may have to join the forum to get this section ) they list several insurance co. that Handel 90 percent of gun trade.
Get to know your suppliers by name. and pay on time many give a discount if you pay within a certain time.
Security is important no windows less the 3 feet off the ground, bars on all windows and doors, motion detectors everywhere, put the counter out of arms reach of any guns on the wall, never have more then one gun out for inspection unless you have a clerk to watch it, same with any high dollar item,
Don't try to go head to head with box stores you can't win so carry better products then they do, and once in a while Put 3 boxes of each caliber of ammo (Rem, Win CCI) and advertise it for 1/3 your cost one day only while supply lasts. then make sure your customers know Wall mart & Kmart will beat your price, I would usually go over and get a cart or two myself.
Their is a lot more to consider but I'm sure others here will mention them to you.
Be prepared to work long hours and make little money for a while but I did pretty good for myself and I liked the work.
Good luck