What's my first step to start affiliate marketing for beginners?

Well before you start making your first million you need to get yourself up and running with a website, blog, shop or something that gives you an internet presence. then when you have got that done then you can start looking at affiliate sites

Alot of he better affiliate marketing companies actually want to see that you already have a site that is up and running etc before they will let you start thinking about selling
so unfortunately you do need to have to do something, spend some money and put in some effort. You can get step by step training here at wealthy affiliate