Good info above from JohnD and Rice Guy.
On sweetening, because you are new to wine making and may not know how to sweeten and what simple syrup is, please consider the following. Simple syrup is made of two parts sugar to one part water over low heat to fully dissolve the sugar. Sweetening is best accomplished for the home wine maker by fermenting the wine to "dry" or about SG 0.992-0.995 and then "back sweetening" or adding sugar "back" into the wine. Part of your instructions will be to add a packet of Potassium Metabisulfite and a packet of Potassium Sorbate. The metabisulfite is to guard against spoilage and the sorbate is to prevent re-fermentation if and when sugar is added to the finished wine.
It is very important to "bench test" the addition to get the appropriate ratio. Start with a known quantity of wine and (say 1 cup) known quantity of simple syrup (say 1 teaspoon) and mix the two. Taste. If too sweet, repeat with a lesser quantity of simple syrup. If not sweet enough, repeat with a great quantity of simple syrup. Once you find the ratio of syrup to wine that you prefer, scale up that amount for the remaining wine, add and mix. If your measurement was accurate, you should have a wine that is very close to the sample you preferred. Add syrup judiciously. If you make it too sweet, there is no simple solution to fixing it.
Good luck and keep us up to date on your progress.