Do you intend to sell beverages with a high alcohol content for consumption off your premises (off-licence)? You need a liquor licence to do so. You can obtain this licence from the municipal authorities. The costs vary per municipality.
Changes to your off-licence
Does your off-licence shop change to such an extent that it no longer fits the description in your liquor licence? Then you must have the licence modified or apply for a new one. You arrange for this with you municipal authorities.