This question is as vague as it gets, and so wil be the answers. I say first decide is it an experiment, or for profit? Depending on that you'll need different

This question is as vague as it gets, and so wil be the answers. I say first decide is it an experiment, or for profit? Depending on that you'll need different research methods, planning, and tools. Especially if you envision some ultimate goals, quickly forget those and formulate the first milestone reachable with minimal effort. At most a proof of concept to take hurdles (function, technical, or other), not a prototype.