Developing a stream of passive income, starts with lots of time and work. The passive part is built after an accumulation of time dedicated to the specific stream of income. In regards to setting up and building a YouTube channel anyone can start with the simple tool of a cellphone (with camera and internet), then deciding upon a topic (ideally one that isn't over saturated), and consistently document content for several months with no expectation of a return or trying to sell people in the beginning, then when a small community has been built you can introduce topic related products that you will get a small commission from (small stream), and as it grows if you hit the monetization level you can generate more income through ads (medium stream).
With my RideIntoCash Channel on YouTube I dedicated three months of creating content in a niche market which slowly grew to a fairly good sized dedicated audience. Now it's nearing the six month mark and I steadily earn $10 daily from YT Ads, $1 daily from Amazon Affiliate links, and had earned $500 from referring people to Robinhood App. This has created a stronger interest in creating content in various other topics such as my journey out of debt and my nomadic living situation. In the future I could potentially live off the videos and content I've created, that's the long short goal in mind