My first venture was in 2013, used to upload and rank fiverr testimonial videos to youtube promoting clickbank products. The guy that did my videos isn't active on fiverr anymore but he was bloody brilliant.
I created a lyrics website. Monetised with Popups etc. Did quite well for sometime till I started receiving copyright notices. Then legal problems started and web host pulled the plug. Good old days, when it was so easy to rank in google.