Trying to Understand 3d modelling around Character Creation

[Shaboopy123]

Hello Nexus, Great work with all the mods and hoping to see if the community can help guide my understanding.
Im trying to figure out how to create character customization's and just now sinking my feet into the water.

I have conceptual designs for my custom races, Im looking for a Modeller who has way more artistic ability then myself, but im struggling understanding how to ingest the model and how it needs to be broken up to create customization options.

Eyes , noses, ears etc.

Is it several different model types segregated from the base or is it several full scale models like a flip book and software somehow manages to filter through it.
Any Articles, directions or discussions on the subject matter I would love to hear about as I am completely lost in my understanding.
Thanks.