Sorry I wrote that too fast.

The main campaign it´s not connected with the expansions.

So I mean play the first campaign with one character, then in the 2 expansions because they´re together a different campaign you should start with other character level 1, on the first expasion and continue with this one in the second expansion,

If you use your main campaign character on the expansions he or she will have too much power to enjoy the expansions. You should play them with a level 1 character.

About the race/class/aligment, all the options are very nice in both campaigns, but if you´re used to BG or other previous D&D games, you will find mages are here pretty weak at the beginning, as you barely can´t control any of your companions in this game, as good as you do on BG, you will have more difficulties with less companions that also not cover you so well. So you need to level up fast enough to become stronger.

For this I choose MONK in the main campaign, (I totally agree with tinyE) and in the expansions i played as a FIGHTER then when I had a decent level, I dualed to Dragon´s Disciple.

EDIT: oh nice! I found OOOOOLD screenshots from my game on the expansions, my memory was not accurate, my character was Fighter, then Sorcerer, then Dragon´s Disciple. Was a killing machine, I will try to find screenshots from the Monk also.

Character (it´s in spanish as I first played the game bought it here in my country, but sure you imagine what is wisdom, intelligence, strenght, etc.) this screenshot was made before fight the final boss.

http://i6.photobucket.com/albums/y216/yatedigo/Neverwinter%20Nights/NWN0000.jpg

Other screenshots:

With the great Deekin
http://i6.photobucket.com/albums/y216/yatedigo/Neverwinter%20Nights/NWN0001a.jpg
http://i6.photobucket.com/albums/y216/yatedigo/Neverwinter%20Nights/NWN0004d.jpg

I guess this one was when i played just as a fighter, before change to sorcerer
http://i6.photobucket.com/albums/y216/yatedigo/Neverwinter%20Nights/NWN0002c.jpg

Fighting
http://i6.photobucket.com/albums/y216/yatedigo/Neverwinter%20Nights/NWN0012.jpg
http://i6.photobucket.com/albums/y216/yatedigo/Neverwinter%20Nights/NWN0002b.jpg

The talking sword
http://i6.photobucket.com/albums/y216/yatedigo/Neverwinter%20Nights/NWN0000h.jpg