Here is a basic recipe that can be used for making snuff.
ground and sieved tobacco flour 1/4 cup
distilled water 2 teaspoons
sodium carbonate (washing soda) 1/8 teaspoon
table salt 1/2 teaspoon
Dissolve soda and salt in water then add to tobacco flour.
Jar and let sit for one week.
That is it in a nutshell. This recipe is quite flexible and there are a ton of details but I wanted to start simple here.
Thanks to @snuffmiller a.k.a. Jaap Bes for the original recipe this is based on, See complete recipe here