What should be the minimum inventory count to get more sales?

what do you sell? I sell tea, cheap and consumable and i sexy numbers very high so if someone needs 500 or a thousand they will consider my product

I would say just experiment a bit. Minimum inventory differs from store to store because it's so dependent on type of product and price. Try it low, try it high, try it somewhere in the middle and see if there is any change in response or sales!