To set minimum and maximum product quantity, go to WooCommerce. Under the WooCommerce section, you will find a tab, Min-Max quantities and there you will find General Setting.
In the General Settings, you will see fields to set minimum and maximum product quantity. Simply put the minimum-maximum threshold for your product and you are all set to go.
Similar to the Minimum Maximum Product quantity, you can also set a threshold for the price. Just below the Minimum Maximum product Quantity options, you can find the fields for the price setting.