People often ask me what I use for my standard gluten-free baking mix. Here it is:
2 cups brown rice flour
1/2 cup potato starch
1/4 cup tapioca starch
2 teaspoons xanthan gum
I make big batches of this. Then I use this for my bread (measure out 2 3/4 cups, and then use another 1/2 cup of flour, generally buckwheat, garbanzo or sorghum) & for biscuits & cinnamon rolls.