Dreamteam67: You can definitely play with less than 6 characters. I have soloed the game twice (my first and second play-through) with a dual class fighter/mage and then a dual class fighter/cleric. In fact, I would suggest starting with only 2 pure-class PC's for the first chapter, and set the difficulty level to high. Why? Because you get twice as many experience for killing monsters and completing quests on highest difficulty as you otherwise would. Experience is divided up depending upon how many PC's you have in the party. So less PC's on highest difficulty = leveling up faster = more kicka$$ abilities sooner. The monsters aren't that much tougher on high. At least one of your starting characters needs to be a Bard if you want to get offered all possible quests in the first town.
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I'd actually advise against cranking the difficulty level UP if you're new to the game - the combat is hard enough as it is!
Especially if you haven't played any D&D games before and are unfamiliar with it's tropes and qualities (like wizards are being really, really fragile at low levels but becoming very powerful later in thei career).
Not to mention that if you're new to the game rules and are still learning how to control your characters, the last thing you want are increased numbers of enemies that'll do twice the normal damage to your party!
Instead, my advise would be to set the difficulty to "Very Easy". :)
That'll give you the same advantage (receiving the double amount of experience points for quests and battles, ergo: leveling up faster) while making the game a bit more forgiving overall, due to reduced enemy damage.
Not that it'll be completely a walk in the park for someone who's never player Icewind Dale before, but you should easily be able to learn the ropes without the game becoming utterly frustrating. :)
As others have already said, playing with 4 characters is perfectly viable. I like to play that way myself, since it's way less hassle than having to controll 6 characters at the same time.
There've been some good suggestions for guides to check out; take a look, but don't become discouraged by to overwhelming amount of information available out there.
In general, a "classical" party*, consiting of a warrior, a thief, a mage and a priest is a pretty safe bet.
Though I'm personally of the opinion that you should play the game the way you like it best; if you like the idea of having a dwarven fighter/thief in you party, do so, by all means!
You guys
can make the game harder for yourselves by rolling bad stats or putting them where they don't make much sense (e.g. a mage with low intelligence), but don't worry too much about it. The advise given in the game should have you easily covered for the most basic stuff.
And if you get stuck somewhere, just come back here and someone will probably help you out. :)
By the way, Imy first Icewind Dale session was also done togehter with friends (everyone controlling one or two chars) and we didn't know
anything about the game. Was still loads of fun! :)
*"classical party" is probably one of those D&D tropes that don't make much sense to those who are not familiar with the game. ;)