Umm I think the question is probably too broad to get good answers. I'd suggest grab yourself a couple of books (the accidental project manager) and a good book on product management. E.g. here's a good one if its a tech product:
So Agile in its true form? Also, if you like what this guy is saying, I highly recommend Marty Cagan’s “Inspired”: Inspired: How to Create Tech Products Customers Love (Silicon Valley Product Group) https://www.amazon.com/dp/1119387507/ref=cm_sw_r_cp_api_glt_fabc_GFXTY44ZRVT6D34BSKX1?_encoding=UTF8&psc=1.
Marty says in the book software engineers are often have the best ideas in terms of product direction, and have the advantage of knowing what it takes to get those features implemented.
I have done product design for startups for 20 years. You have quite a long road ahead. Here is my suggestion:
You can hire a freelancer or an agency. But either way make sure you hire someone who can show you their products in the App and Play stores if it is a mobile app. Ideally you won't be leading this on your own. You likely aren't qualified to know what is the right path and what is a reasonable cost and time. Things like whether you should build a PWA vs Native vs hybrid apps will be very important in the direction of the build. Each developer will be more skilled in one or the other. They will likely push what they're best at. If you can find someone to partner with who is technically skilled, you should, but that is hard to do. Take your time hiring this developer. If you happen to be in Dallas, I can recommend people. If not, try to build connections in your city in the tech community. So, when the time comes, you will at least have people to help guide you.
Lastly, I'd recommend you read Inspired by Marty Cagan. This book will give you an idea of the venture you are undertaking.
Good luck!
You might consider a quick read-through of Inspired or Swipe To Unlock over a weekend. They may help demystify the process of launching a product and empower you to evaluate this opportunity yourself more effectively.
These books have helped me start and grow as a PM. Highly recommended regardless of your seniority.
Podcasts on my commute, about an hour during the work day reading a book of some sort. Finally getting around to Inspired after it's been on my shelf for a year+.
When technical up-skilling was a priority for me, I always had some sort of FOSS or side projects that I'd chip away at in my free time. Learning Go is a great book but I got way more out of farting around with the Prometheus and k8s codebases.
Just started my first PO role really recommend this book. I already had a scrum background but this fills in some of the gaps for me
https://www.amazon.com/INSPIRED-Create-Tech-Products-Customers/dp/1119387507
Two recent favorites:
https://www.amazon.com/INSPIRED-Create-Tech-Products-Customers/dp/1119387507
https://www.amazon.com/Good-Strategy-Bad-Difference-Matters/dp/0307886239
Anything from SVPG or Marty Cagan sparked great discussion.
The big book that everybody suggests for PM is Inspired by Marty Cagan. See here:
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https://www.amazon.com/INSPIRED-Create-Tech-Products-Customers/dp/1119387507