Silvers tutorial is great, if you want a short row heel (which is good because it doesn't matter if you're doing the sock cuff down or toe up). Cuff down gusset heel, Amy has a video
for that. As for toe up gusset heel, I found instructions on that from Wendy, ala Wendy Knits!
[pdf, for fingering weight socks, easy enough to adapt to worsted, if you're using that].
It's just a practice sock, so don't worry about it. You can always pull the heel out and try again! My first short row heel was started WAY too soon, and didn't even make it to the start of my heel. (toeup), and my first gusset heel I started too late!