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Building a website and creating advertising materials are a great way to get some attention for your business. Print up flyers and business cards to pass out at your store or shows you attend. All of your advertising should include your business's contact information (the address of your store, your phone number, and your business hours). You can build a website on a free host website like WordPress, or pay a little more for your own domain through other website hosts. Social media accounts for your business allow you to advertise new inventory, specials, or general information. Facebook and Twitter both allow "business" accounts, so they're a great way to start. If you have personal social media accounts, be sure to advertise your business accounts! Each state and country has their own professional organization for coin dealers. Joining one gives your business more legitimacy and tells your customers that you're the real deal. For example, if you're a coin dealer in the United States, you might consider joining the American Numismatic Association. Coin dealers in the United Kingdom can look into professional organizations sanctioned by the Royal Mint.
Market your business. Cultivate a social media presence. Join a professional organization in your area.