Things to consider too are: Location because with less people, expect a day with no costumer. Business that an owner is good at like selling in demand stuff( food, water, service), although you have many competitors, if yours are the best then costumers will come back again and again
In addition to that, make a survey regarding of your product that you want to introduce in the market, that is the most effective way of marketing cause you will know if your product is good or not, same with Bitcoin before entering in Bitcoin world make sure that you have an idea how does it goes so it would not hard for you to understand all terms here in Bitcoin world.