Hello and Welcome!
Re stitch patterns: This
is a discloth pattern website, but it has wonderful examples of stitch patterns and repeats--I use it a lot!
Re holding yarn: Watch Amy's video
and try to mimic how she holds the yarn. (It takes practice and patience.) It sounds like your pinky finger is holding the yarn too tightly; remember to keep it relaxed.
You might also try holding your left needle VERY LOOSELY with your pinky and ring finger to allieviate stress; it takes some getting used to, certainly, but I find it easier on my left hand and wrist because it stabilizes those two fingers. (Mine want to roam about, too!)
Re wrist brace: I'm not sure about that, but I highly recommend (almost order, in fact), that you take breaks every 20 minutes or so and stretch your arms and wrists and fingers. Knitting can be all-absorbing (I know), but you want to avoid carpal tunnel! Try here
for exercises. They've really made a difference for me and most of the other knitters here. You want knitting to be comfortable and pain free, so get in the habit of stretching.
Welcome again, and please post pics of your work--we love that stuff!