"The Mom Test" by Rob Fitzpatrick will teach you how to figure out what your customers really want, because it is almost certainly not what they are asking for.
"How to Make Sense of Any Mess" by Abby Covert. How to organize and present information.
"To Sell is Human" by Dan Pink. This is how you should look at sales and marketing.
Assuming you are going to be building software:
"Seductive Interaction Design" by Stephen P. Anderson.
"Planning Extreme Programming" and "Extreme Programming Explained" are must-reads for working with software teams.
I've worn both product and engineer hats on my path to being a sort of rentable CTO, and am always happy to help out people that are getting started as a PM -- email is in the profile.
Good luck!
https://medium.com/@noah_weiss/50-articles-and-books-that-wi...
Includes books and articles. Been very helpful so far.
"Design for How People Learn" by Julie Dirksen: instructional design, but any product will involve a bunch of teaching.
Will return with more if I remember any.
Being able to get people in your corner will help you.
Don't Make me Think, Zero to One, The Lean Startup, and anything about capturing metrics and data driven decisions is great too.
"Lean startup"
"The hard thing about hard things"