What should be the next crucial steps before looking for investors?

Hello everyone, I have been working as a solution architect (both technical and business process functional) in the enterprise software domain (SAP) for over a decade. My partner is a Computer Science (AI/ML) professor at a large accredited university overseas and has been teaching AI/ML at both undergraduate and graduate levels for over six years, as well as supervising PhD students (with multiple published papers in AI/ML to his credit). We have been working on the design and feasibility aspects of leveraging ChatGPT-4 or other suitable existing LLMs to build an enterprise application that has potential to save serious money for organizations. Naturally, I have domain knowledge and technical expertise, while he is well-versed in AI/ML both theoretically and in building industry-scale applications. We have overcome the technical barriers and should be able to build an MVP/prototype within the next few months without any outside help. As we both have full-time jobs, we are giving ourselves about 4-5 months before we are ready to seek funding. Would you kindly suggest some online materials that would help us allocate our time efficiently while ensuring we complete all the necessary steps expected before fundraising? We would also greatly appreciate any direct advice. I recently discovered this site and have been impressed by the wealth of insights available just by browsing the comment sections. I figured this would be the best place to start once we have the feasibility aspects nailed down. P.S. Eventually, we would like to add one or two more co-founders as well, but that's a topic for another thread.