A few things I've seen mentioned, mostly for FM quilting is to practice on fabric with lines or plaids.Try a fabric that has gentle swirls or a large print...same idea for all, to get you comfy at practice.
I make squares of backing,batting & top fabric to practice FM quilting on,mine are usually at least 18"sq.Using the hopping foot,regular tension....it works pretty good.One thing....for me, it takes a lot of time.More than I'd use for bed size quilts.But not a prob as I don't make many big quilts anymore.
Forgot to say, this is a good use of fabric you'd rather be rid of.