Hi Courtney!
Awesome idea, always smart to get a jump on new skills during some (typically) quieter weeks at the end of the year! Another huge resource that I usually find myself on whenever I'm facing a velocity issue is @sanfordwhiteman's Blog: TEKNKL Blog (Velocity Tagged Content)
For me, one of the biggest resources was this community. It can be very task-specific (i.e. I want to do X with velocity, how do I do it?), but once you get the basics down of how it works, how to build and test a script, for me it's all about practice. I'm sure there are personalization items you run today using segmentations, snippets, or dynamic content, try to replicate the logic in velocity and use the Community as a place to come if you're hitting road blocks!
Good luck!
