1. UVs in code and UVs in 3D programs are the same thing, just represented differently. UVs are texture coordinates on meshes. They are associated with poly vertices and NURBs control vertices. On a mesh, all UVs line up with the vertices. On a 2D plane, such as the UV Texture Editor, it is like a puzzle or a clothing pattern. It is an arbritrary 2D square surface that is "wrapped" around the entire mesh.

2. There is a basic stickman walk cycle tutorial in the VIP section. It is a good start. "Inspired 3D Character Animation" is also a good resource. It's a spendy book, but I think it's worth it.

3. Animation and texturing is relative easy in Maya compared to other programs. In general, though, then can be difficult to learn. Take one at a time and have patience.