Try refering to the numerous posts on how to whack dragons.
Of course, for your fighters to go toe-to-toe with the dragon, you need to be of a decent level.
Okay.
Here's a run through.
You're gonna need Magic Resistence, Lower Resist, Pierce Shield.
Firstly, buff up your party. Chant, Bless, Improved Haste, Resist Fear, Defensive Harmony. Basically, all the spells that add to the character's power.
Cast Magic Resistence on the dragon first, Pierce Shield, and then Lower Resist (If your Cleric is of a high level, cast it twice).
Have Jaheira cast Insect Plague on the dragon
Next, send your fighters, and summoned creatures (preferably Mordenkainen's Swords) to attack the dragon.
Meanwhile, have your spell casters use Magic Missiles on him (think Minor Sequencer).
With some luck and a decent party, he should be dead soon.
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A Drawn Sword;
A Trickle Of Blood;
The Tempest Is Brewing.
Nemesis....
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