A few hours in the fridge should bring the temperature down, but never store any wine for more than a few days in the fridge. Serve your Champange in tall, narrow-necked glasses, called flutes . There are different types of Champagne. Extra-dry is less dry than Brut. Sec is sweet, and Demi Sec is even sweeter.
Vintage bottles are, like most wines, from a single year's worth of grapes.
Unlabeled or non-vintage bottles are from a blend of years. For related wines, note that Spain calls it's wines of this type Cava , or Cellar. South Africa uses thes term Cap Classique or Cape Classic. We also have a calendar of wine events in Japan.