Been talking to a lot of early stage folks, and I have noticed some patterns, that I think you should avoid when you are trying to build a product first company.
You are subject matter expert on a field, doesnt necessarily mean you are an expert at understanding the behaviour & motivation of your users, understand this before you build. You maybe a user of your product, but all of us have biases, so please talk to folks to whom your product could be useful , but they are tangentially different from you. When you think about users, know that research/patterns exist for a reason, dont build something overly new - in terms of designs, flows & usage. If you really want to introduce one small change at a time. Dont try to achieve a LOT in the first months of launching only.
People think about launches very differently.
Founder led hype
You can do all or none, however product needs marketing, because even a good product needs to be FOUND. And account for it, dont dismiss it.
Get your team in place. Do not think that you will have time to fix tech debt & build a bad system (unless ofc you are not a tech heavy product, then ignore this) Always build efficiently even at MVP stage people expect products to work as intended.