No one, nowhere, ever, has been good at every part of running a company.
EVERYONE sucks at some part of it.
MOST people suck at MOST of it.
Some founders and executives suck at ALL of it EXCEPT for finding great people and aligning them to their vision.
Building a company is a team sport.
Do NOT fall into the trap of thinking that you need to do this all on your own.
Do not fall into the trap of not sharing your concerns and confusion.
Ask for help.
Recruit the very best people you can find. Ensure they have a clear sense of your vision (or let them help you refine it), and give them the space to help you win!
Everything else is fear and/or ego.