In the beginning these things are hard for most people to get the hang of.
The only real difference between folks that figure it out & those that don't is persistence(being stubborn helps) :wink:
Edit: You can use the Porter mod when starting any new game.
This mod let's you quickly populate your world with Sims from your bin.
Over the years I've collected many themed households to my bin.
If I'm playing a 17th century Caribbean archipelago or an isolated Mars colony.
I have households ready to go.