I personally feel, entrepreneurship is learning on the way as it demands. You never know everything or your acuired skillsets may never be sufficient to be successful entrepreneur. As you build your product, keep updating your knowledge in other fields like marketing and sales. If you build really useful product you definitely get succeed even with no prior experience on marketing because people buy it.
Coming to making some money, you can use your strength so you don't spend too much time or energy in making money and use rest of time on your project
Coming to making some money, you can use your strength so you don't spend too much time or energy in making money and use rest of time on your project