Hi :) The 3 products that have been in heavy rotation for me to define my curls are Mixed Chicks Leave-in Conditioner (used when I two-strand twist), Twisted Sista Curl Activator Cream (like $4 at Walmart), and African Pride Shea Butter Miracle Bouncy Curls Pudding (also used when I two-strand twist). Try those out and don’t touch your hair too much after you’ve styled it!
As far as concealer, some that I like are Cle De Peau concealer stick (it only comes in 4 shades though :/ ), Cover FX Concealer in Deep, and Revlon Photo Ready concealer stick. You should try setting your concealer with a translucent powder to prevent it from creasing. Hope this helps!