There many recipe's for elderflower wine, just a couple from the net, tho I haven't made any yet, I prefer elderberry wine.
http://winemaking.jackkeller.net/index.asp
ELDERFLOWER WINE (1)
* 1-1/2 pt fresh elderflowers
* 2 lbs granulated sugar
* 1-1/2 tsp acid blend
* 1 crushed Campden tablets
* 7 pts water
* 1 tsp yeast nutrient
* wine yeast
Put water on to boil. Meanwhile, separate flowers from stalks and wash to remove insects and road dust. Put flowers and sugar in primary and pour boiling water over them. Stir well to dissolve sugar, cover with sterile cloth, and set aside several hours until cool. Add acid blend, crushed Campden and yeast nutrient, stirring briefly. Recover and set aside for 24 hours. Add yeast. Ferment six days, strain off flowers, pour liquor into secondary, and fit airlock. Rack when specific gravity is at 1.005, top up and refit airlock. After additional three months, stabilize, sweeten to taste, wait ten days, and rack into bottles. Age six months before tasting. [Adapted from Steven A. Krause's Wines from the Wild]
ELDERFLOWER WINE (2)
* 1 pt fresh elderflowers
* 12 oz can frozen white grape juice concentrate
* 2 lbs granulated sugar
* 1-1/2 tsp acid blend
* 1 crushed Campden tablets
* 6-1/2 pts water
* 1 tsp yeast nutrient
* wine yeast
Thaw out grape juice concentrate and then put water on to boil. While water rises to a boil, separate flowers from stalks and wash to remove insects and road dust. Put flowers, sugar and grape juice concentrate in primary and pour boiling water over them. Stir well to dissolve sugar, cover with sterile cloth, and set aside several hours until cool. Add acid blend, crushed Campden and yeast nutrient, stirring briefly. Recover and set aside for 24 hours. Add yeast. Ferment six days, strain off flowers, pour liquor into secondary, and fit airlock. Rack when specific gravity is at 1.005, top up and refit airlock. After additional three months, stabilize, sweeten to taste, wait ten days, and rack into bottles. Age six months before tasting. [Author's own recipe]
making a fizzy wine I.E. champagne is no different than making a bottle of fizzy beer, just bottle the finished wine with a teaspoon of sugar in the bottle
BUT USE STRONG CHAMPAGNE BOTTLES NOT POP BOTTLES nobody like exploding champagne!