Learn as you go...
Step-by-step, the first thing you do is learn how to make videos and to do the proper SEO for them.
After you have that down pat, then work on making money.
You can do that by sending people to affiliate offers or your blog.
You can also make use of it by embedding your YouTube videos in your blog posts as a means of increasing the amount of time people spend on your site.
This will tell Google that users find your website helpful, and that should increase your rankings over time.