Shopping list:Vodka - you determine the amount you want to make. My last batch I bought vanilla vodka to start with...it helped intensify the flavor. Any vodka will do. You don't have to buy the really good stuff.
Vanilla beans - You can buy different types of vanilla beans. I use Madagascar and Mexican. I mix them to get a great vanilla flavor. the amount you use again determines the intensity and the length of time it takes to get to strength. You can buy vanilla beans on e-bay for a very good price.