Need help building my website/App.

I have a YouTube channel and have hosted live coaching in private Facebook groups and for free. I am setting up a monthly membership plan and will do in App challenge purchases. I need assistance please in helping me finish my passion.io App, connecting Stripe, zoom, understanding how it all works. I own several domains I have not activated. I also have an Amazon store and have not attached to anything. I need some guidance please.
ASAP is desirable. Thanks.