What do you mean by posting your business? There are a few different avenues you can try to get a larger client base. You can list your services on places like google places, Yahoo! Local or Bing. You can also use their ad services by using google ads or Microsoft ads (used to be Bing Ads). That way when people use search engines your ad can show up somewhere on the page. You can also try using social media, it will help you gain exposure while also connecting you directly with your clients. You can use ads now there too and focus them towards your clientele.
I will be doing a post later about Google Ads and Microsoft Ads (Formally Bing ads) but those are both very good options. If you do use those, then you want to make sure to do your research first because it can lose a lot of money. There are a lot of steps to make sure that you do the campaigns correctly to best suit your business.
Social media is the best free way to advertise or you can go old school and take out ads in the paper.