The videos here are about as good as you're going to find and Amy doesn't chatter away and keep doing the same thing again and again and again and again until I lose interest. You can always play the video again and it's much easier to find the spot you want to see than in some longer videos. The knitted cast on is a good one to learn soon, when you've done it, you're most of the way to actually knitting already. Do keep your cast on loose, probably as loose as you comfortably can manage.
I should never overestimate my basic arithmetic skills.