Mods FAQ: Links to Tutorials & Resources

Are there any tutorials on making facial/bodily mods? I wanted to do a mod of animal crossing esque characters similar to this one: http://www.savestatecomic.com/dlc/
https://marketplace.secondlife.com/p/full-perm-Bear-Doll-mesh-avatar/6460623 and characters with more cartoony facial features, but wasn't sure where to start, especially for exporting a sculpt and making clothing work with very exaggerated characters. Where would an absolute beginner start for these things? Thanks!