I like the "Learn Vim Progressively" guide. It starts with just a few commands, and introduces new ones in small batches when you feel comfortable with the ones you're using.

http://yannesposito.com/Scratch/en/blog/Learn-Vim-Progressiv...

I'd add windows to your list of things to take a look at once you feel comfortable with the editor. You can split your workspace with ctrl+w followed by 'v' (vertical) or 's' (split). Then you can switch between those panes by pressing ctrl+w twice, or ctrl+w followed by hjkl or an arrow key. You can also resize the windows and stuff, it's great for things like viewing a header and source file at the same time.