My first large success online was as a CPA marketer. After buying tons of courses online that didn't work out I bought a $9.90 course teaching how to get tons of page likes for 1 cent each on this newer platform called Facebook.
From there I built up fanpages of millions of fans within my first 2 months of running Facebook Ads. Mostly in the pet market so I found a CPA offer from MaxBounty and started promoting it daily and hit $1K/day quite quickly as an affiliate.
That was the start of my online career. Fast forward today and things have grown to billions in sales influenced online.