At the fN Happy Farm where I was WWOOFing, Angela had a few bags of sheep fleece that she wanted turned into yarn for the purpose of holding up tomatoes and such. I thought this would be a good place for me to experiment with making yarn, and she agreed to let me give it a go!
This post has my own pictures and notes from the experience, but it's not very comprehensive. If you want solid instructions, try these places: Building An Ark - Preparing Wool for Yarn Part 1, Part 2 and Part 3; and Joy of Hand Spinning carding instructions.
Obviously you need to get rid of the gunk. Here is the soap used to wash the fleece.
Now to get into making the yarn. The fibers need to be sussed out into the longest fibers possible. I don't know how to explain this in words - but when you do it, it makes sense!
Here is Angela's spinning wheel. I never got to the point of mastering this though. You have to combine the rhythm of your foot with doing something very specific with your fingers... yeah I think I'll work next on learning to use a drop spindle, then move into this!