I love this post from Daniel Zarick, a former product manager at Twilio, about the strategy at his old company. The focus was always on starting quickly and figuring things out as you go. Or as they put it: “Draw the owl.”
Start figuring it out. Put some of the pieces together. When you truly get stuck, ask for pointed advice. Stuff like “What sort of salary should I be asking for at my experience for this type of job?” and “Do you think X marketing strategy is good for this type of product?”
Nobody else can lay out all the steps for you, because nobody else has been you or is in your situation.
You’ve just got to draw the owl.