Some advice on pizza stones:
Which pizza stone should I buy? | Serious Eats : Talk : Cooking and Baking
Yeast? It depends on the recipe you are using. Some call for sourdough, some call for fresh, some call for instant. You will know what you like and prefer once you start using it.
An article on Fresh Yeast:
Pizza Protips: Working with Fresh Yeast | Slice Pizza Blog
As for Flour, again, it depends on the recipe. Some call for using Bread flour over All-purpose. Bread flour has more proteins than All-purpose.
The best advice I can give, is just start baking bread. Try different recipes and learn from experience what the different ingredients do. Experiment.
Yeast in general:
Pizza Protips: Yeast | Slice Pizza Blog