Novice is typically limited to those of a particular age, within the first two years of showing, or have not obtained so many blue ribbons. Each show has slightly different rules, but basically it's for those new to showing.
If you have a green horse and are an experienced rider, look for green horse, novice horse, or schooling classes. Typically the show bill has a short blurb on what the division is about.
U/s is the flat class... on the rail w/t/c
If your horse says no, you either asked the wrong question or asked the question wrong
And God took a handful of southerly wind, blew His breath over it and created the horse