I am new to quilting and hand quilting as well. Years of sewing experience. Any way, I’m not sure you will like that big of a hoop. I'm doing and oversized King and it was too heavy and hard to hold the weight of the quilt and be able to reach far enough under to feel the needle. But I think it is a matter of experience and preference.
Two options come to mind to practice with. First get some clearance fabric don’t worry about the actual piecing of the fabric. However make your quilt sandwich and practice on it. Or try your local goodwill, salvation army and see if the have any thing that would work. I know it didn't take too long to get the hang of it and you can always rip out any stitches you do not like on the actual quilt. Hand stitches are easier to pull out.
I was told don’t worry about the length of the stitches just keep them the same. And most important enjoy yourself.
Diane