Hi Brooklyn,
Listen to Linda.
There is a wealth of free information available online. Make sure you learn and master the basics before you start throwing your cash around; you may find yourself with analysis paralysis and a lot poorer.
If you're looking for something simple to start off with, and you can manage writing a few articles, then I'd say start with article marketing. It involves writing articles on specific niche topics, then linking to affiliate products or resources using your bio box. There is a free course called
Bum Marketing which offers some great basics (he'll try and sell you stuff through his e-mail list, but don't buy it if you don't need it).
Another method would be to set up a free blog, write about a topic you're passionate about and recommend products through your affiliate links.
You probably won't see overnight success with any of the above (or anything really), but it is possible to make a nice income online through affiliate marketing.
~ Teli