Thanks! Not exactly videos, but some of the bigger AMHA shows (and maybe others) are shown on-line. Watch for banner ads, pinned notices or check Mare Stare to see if they have any lined up. Of course, even better would be to go watch a show in person and ask questions when people aren't busy.
Halter will be the hardest and you might want to search on the forum here for pointers. You can hand set the feet, but getting the horse to show to its best advantage is not easy. Plus there are lots of different ways to do it! Halter and Junior stallion means the same thing - junior stallion is just the halter class he will be going in. If you are an Amateur, you could go in both open and Ammy classes, but they will run the same way.
In some color classes all you do is walk around in a big circle, but in most you also have to set the horse up. They won't check teeth or movement though, so lots easier than halter.
Good luck and have fun!!!