Unless you are an inventor, most likely you are selling a product or service that is being offered by someone else, somewhere, at some time. The first person to start your type of business would have gone through a lot of trial and error. Thank that person, as now you can not only profit by not repeating the same mistakes, but by learning what they do to get business.
The best way to do this is to practice what any business person knows: know your competition. The most beneficial thing you can do is to study what they are doing to attract customers.
Go online, do a search, pull up the web sites of your competition, and start taking notes.