New to character work and I'm looking either for some advice into best practices or a recommendation for a course or something that gets into some finerdetails about character modeling for animation.

What are some best practices when it comes to finer detail in character animation model? For instance, I'm looking to add some wrinkles into clothing but am unsure if I should model the wrinkles directly into the geometry or go the route of building a displacement/normal map? Are there other techniques people use that I should look into?

Please let me know if I'm not even asking the right questions here. Thanks!