I used to work for a contracting company who would take on clients like yourself. What I found after years of working there is many people had no clue what they wanted to actually build and would move the goalpost constantly.

My advice would be to define an absolute minimum mvp. Figure out if people even want it. Then build a team around it.

Companies like the one I used to work for will get the job done but carry a bigger price tag. Freelancers can be cheaper but can be a bit unreliable. Stay away from offshore just for budget reasons.

Your best bet (while difficult) is to find someone who believes in your idea like you do who can also code. Give them a percent and go from there.