Hi there quiltycats and welcome to the world of spinning
You don't have to knit to spin - you could learn to weave, or crochet, or to use a pegloom. You could also sell your yarn especially if you hand dye it

Or of course you could learn to knit

it's great
The usual way to describe handspun yarn is as wpi - wraps per inch. You wind your yarn around a ruler or special measure, with each wrap touching but not squashed up against the next one, then count how many wraps there are to an inch. You can also give an idea of its gauge by yardage per pound, but wpi is so much simpler.
Second hand drum carders are a bit like hens teeth but you might get lucky.