Ask yourself why you want to start the business first. Provided making money isn't the only motivator, start talking to people in the spaces that excite you and

Ask yourself why you want to start the business first. Provided making money isn't the only motivator, start talking to people in the spaces that excite you and your team. Design/mock some simple concepts, show them to people, get feedback. Find pain points, offer hypothetical solutions, let the market shape your ideas/thinking. Get that feedback engine in place, and the ideas will flow.