How to make african american hair curly without it frizzing up?

I want my hair to be nice and curly, without it frizzing up after a couple hours. I have african american hair, its relaxed and I tried products that are suppose to make our hair curly but its failed. please tell me any ideas or tricks you have. NO WEAVE,r:3,s:104&tx=-41&ty=-102
^ heres a link to how I’m hoping my hair could look like.

If i want to get my hair cut but i don't know what the hairstyle is called what should i do?

i want it cut like J.Lo cut hers in the movie enough see?:

but i don’t know what that hairstyle is called…also i have african american hair and seeing as my hair is nappy would that be a smart move as far as getting it to stay like that without spending 40 bucks to get it done every two weeks?