What order should I do things in if I am starting from zero?

I want to offer online courses. There are many moving parts: 1/ Opt-in funnel, 2/ Facebook ads, 3/ Course website with course content, 4/ Member payment processing, 5/ Member login. What is a quick way for me to get started without getting bogged down in building out all of this infrastructure. I realize my thinking on this subject makes it feel overwhelming and complex. How can I change my thinking? Creating free courses on YouTube feels easy. But building the back-end systems to get payment from students and control access feels complex. How should I start? Do I need everything to start? Or is there a simpler way to start?