Try this simple gluten free flour blend for all your baking recipes at home. For extra binding, you can add xanthan gum, if called for in the recipe you're using.
Moisture control is more important than temperature to keep the flour fresh. Storing the flour in an airtight container is a must.
Note that potato starch is not the same as potato flour, though sometimes potato starch is erroneously labelled as potato flour. Make sure what you buy is a refined, white powder, as true potato flour is made from the entire potato, including the skin, and is less refined.