Affiliate Marketing Secrets

Hello. I have been stressing myself out with starting a business. I keep coming across different approaches to make money online, but I can’t choose one. I might end up making niche websites and putting ads and affiliate marketing online.
The real issue is, I’ve come across so many things that say I can make six figures a year, that my mind now says I will make six figures a year, when I’m a teen.
Should I worry about starting this business, or should I worry about getting good grades to have a good job after college that will pay six figures? Is this online business thing going anywhere?