Need suggestion on building an entire product from scratch.

I'm developing a product of my own that will help small scale industries. Things I've done till now: * Created business document that consists all features it will provide * Finalised Tech stack * Created E2E flow * Created ERD & DB schema

I need suggestion on- * Should I jump on coding or there is anything that needs to be taken care first * I've small team of 3 people, any suggestions on distribution of work.

Any advices would be appreciated, thanks guys!