How do you become a fitness trainer?

I want to become a fitness trainer, but I'm confused about the process.How do you become a fitness trainer?a personal trainer? you need to take a certification test....the AFAA exam if the most recognized test and most difficult..il be taking it next year and passin! but there are a lot of other tests ask a trainer if you want to know the other respected schools. you also might want to take a few nutrition classes