CC from Origin/Sims 4?

Hello,

I haven't played the sims in years let along down loaded custom content. I know how to add mods and custom content for my game, but I am having trouble adding sims I downloaded from the gallery that have CC into the game. They all show up blank, no hair, no clothe etc. Can you please help? I found some awesome sims I want to play with from origin but because they have CC they are not showing up correctly in the game.

Thanks!