I remember Corriedale being the easiest wool to spin. It's also a very common breed to grow in this area for wool, so there was a lot of it for sale at shows and fairs.
Merino took a bit of practice to "get the hang of," since the fiber is much shorter. I learned to spin cotton (even shorter...
Sure! As long as the fiber is long enough to spin, you can make yarn. The difference is what you want to make with it. There is wool to make rugs with, and super fine wool to make something you'd wear next to your skin. And everything in between.
I will have dig out some of my sweaters for pictures. I had a small business for a short time, but haven't done any spinning or knitting in several years.
I once had a woman ask me at a show why I charged so much for my sweaters, because, "You like what you do."
'Scuse me??? I bought the wool...
Wool for hand spinning.... :drool
As a hand spinner, if you put jackets over their coats, the wool stays MUCH cleaner. Cleaner wool fetches a premium price.
I don't know what breeds are meat breeds; I'm more familiar with the ones raised for wool.
https://www.backyardchickens.com/threads/what-did-you-do-in-the-garden-today.670277/page-5531
If you want to talk gardening, this thread has a bunch of dedicated gardeners.