Apply to join the YouTube Partner Program when you feel confident in the interest and following your videos have garnered. There is no set following numbers needed to become a partner, but YouTube must see that your videos have interest and are growing a following before you're accepted. Sometimes YouTube will contact you directly about becoming a partner, especially if your videos have gone viral quickly. If not, you can apply on the YouTube partner page by entering personal information, describing a marketing plan, and defining your video genre.
From the looks of things, YouTube's top-line growth hasn't been hurt much by worries among some companies -- for example, Cisco Systems (CSCO) , which just announced it's halting its YouTube ad spend -- about the running of their ads against content they find to be inappropriate. It also doesn't appear to have been hurt badly by YouTube's attempts to appease such advertisers by "demonetizing" videos that its algorithms deem unsuitable for running ads against, or the backlash such actions have sparked among affected content creators.
Next let’s break down the types of advertisements on YouTube. You’re probably familiar with them if you watch any amount of YouTube videos. There’s the bottom text based ad that is displayed at the bottom of your video, and then there is the clip that plays at the beginning of your video. You can select which of these ads your video can have, and it might make a difference depending on your audience or how much revenue your video brings in.
YouTube earns advertising revenue from Google AdSense, a program which targets ads according to site content and audience. The vast majority of its videos are free to view, but there are exceptions, including subscription-based premium channels, film rentals, as well as YouTube Premium, a subscription service offering ad-free access to the website and access to exclusive content made in partnership with existing users.