Replying to 3D Modeling Programs and 2D Skillsets

Hey all,

This might be a longshot since it seems most everyone in here works primarily in 2D, but does anyone have much experience working in 3D, either through AutoCad, Rhino, or Sketchup? I'm looking to start developing my own skills, but wanted to know if anyone had ideas of a good place to start: tutorials, websites, books, online courses, anything.

Similarly with 2D, Illustrator and PS, I can do rudimentary stuff, but in order to progress further I feel like I'm just staring at a sea of tutorials, books, etc.

Any pointers or direction would be much appreciated.