There's not much in the way of directions required here, really.
Combine all the ingredients together into a suitable sized container to hold everything, and mix them together well.
I probably should have started in the bag, to easily shake and mix. A canister is also great, if you have one free. But, the bowl made weighing ingredients as I added them easier than working into a freezer bag.
The total combined weight here came out to 640g. This blend does NOT include any binding ingredients like xanthan gum or psyllium husk, so you will want to add those as required per recipe. This approach works out better for versatility.