OK Mate!
First I suggest that you get your hands on a good book that will help you understand how and why. It was a companion to a series on French Wines called "Floyd Uncorked" Check out AMAZON
http://www.amazon.co.uk/s/ref=nb_ss_w_h ... &x=10&y=12 they start at 1p but don't be put off by the prices - it's a good book. The wine side of the programme was presented by Jonathan Pedley who knows his stuff. If you can get a copy of the series then it is a good watch.
Another good book to indulge in is Oz Clarke's Wine Atlas
http://www.amazon.co.uk/s/ref=nb_ss_w_h ... &x=16&y=16 Gives you a good idea of the worlds major wine producing areas and their wines.
Now - before we go any further I have to stake out my corner so to speak. Everything I write is
MY opinion

I have formed these opinions after drinking wine for some 25 years and I know what I like - as does every other drinking person

Like many others my introduction to wine was at Bernie Inns with Blue Nun, Mateus Rosé and Bulls Blood..............GHASTLY STUFF
As you know, I live in France, Blaye to be exact. That is in the Bordeaux Wine Region and in
my opinion it is the best wine producing area in France., probably in the world.
Here we produce Red, White, Rosé, Clairet (Claret) Sautern and Crément de Bordeaux (Champaign).
Other wines of the world that I enjoy:-
Reds and Whites of Portugal AND Madeira and Port.........................
GOOD Italian Reds.
Considering the number of countries in the world that produce wine you may ask why my list of likes is so small.

Well, set against my favourite French wines I am afraid that they don't stack up to my pallet. Believe me, if they did I would drink them
So, having laid my cards on the table the answer to your original question about White Wine and wine labels.
This will tell you about labels
http://www.thirtyfifty.co.uk/spotlight-wine-labels.asp.
Glasses:- It is most important that you drink from the right sized and shaped glass to get the best from the wine. Never use a fancy cut patterned or coloured glass. See info here
http://en.wikipedia.org/wiki/Wine_glass
White wines in general should be served chilled and the serving temperature will normally be printed on the label. I put the bottle in the fridge a day before I am going to open it. I open it just before I want to drink it and put it in a wine cooler so it can stay close to hand but cool till empty!
Generally sweet whites are 'pudding or desert' wines and good ones are expensive because of the production requirements.
My favourite whites are:
FRANCE.Entre-Deux-Mers, Chablis, Loire.
PORTUGAL. Vinho Verde,
I hope that gets you started but I will try and post more later. Any questions then ask away and I will try and answer them.
Cheers!