I used to use fresh yeast. I think it was 2 oz yeast to 3lbs of flour. Method as Chewbacca wrote.
As for freezing - It probably does work, but after cutting your piece off the frozen block you need to leave it to thaw out slowly before use.
I used to freeze prepared dough and use later. Even after slow thawing it never had that spring of freshly made dough.
Bereavement wipes out everything


