It will depend on what merchandise you are planning to sell. If you are choosing between selling in the city or not, research what items would sell in the area, the demand and price range and if it is something that can be maintained. You must also research on how much items your starting would be, and your availability either online or physically while taking care of your kids and managing the business. If you plan to do shipping too, check which couriers are accessible in your area and which is the cheapest.