Hi there – here we go, a few links for you to look at/work through:-
https://www.ycombinator.com/library/4D-yc-s-essential-startup-advice
https://www.business.govt.nz/starting-a-business/
https://www.ycombinator.com/library/61-order-of-operations-for-starting-a-startup
https://medium.com/better-marketing/the-first-8-things-you-must-conquer-in-a-startup-f89c58926088

This link around using Lean Startup Concepts is very good – https://en.wikipedia.org/wiki/Lean_startup