You can find a recipe for a yeast starter somewhere on google if you type in "yeast starter".
No
YEAST!
Fresh compressed yeast has half of the rising power of dry. You can cut the amount in the recipe by half or double it depending on what you have and what the recipe calls for. (Note: Most cookbooks for home use refer to dry yeast for recipes unless otherwise stated in the recipe or Preface)
you definately can't. so go make the yeast now!
Not unless the recipe specifically calls for yeast. The baking soda generally does the same thing.
no because it won't turn out right.
because it has less yeast in the recipe :)
As long as the recipe calling for regular flour also has baking powder or baking soda in it and you don't put that in also. If there is yeast in the recipe, then no you should not use self rising.
Good Question
Yes.
Most likely the recipe has yeast in it. Keeping the ingredients warm helps the yeast work. For other things, it would help the milk to blend with the other ingredients if there is shortening in the mix the milk is added to.