this may be a bit late post but o well.
i usually hav 4 fighters:
me pure class fighter
jaheira fighter/druid can wear plate mail etc. and casts major spells
aerie cleric/mage
anomen fighter/cleric
imoen/ thief/mage.
minsc ranger
that was my first ever party to complete the game and it was quite easy (the final battle i mean)
now i use
me (my old pure class fighter level 17 in chapter 2
)
me Cavalier (she's ok, never seems to hit???!! )
me (fighter/thief multiclass)
Jaheira
Aerie
Nalia (only temporary til i beat de'arnise keep)
this is just my personal party, go with who ulike and look at D&D 2nd edition rules and read up about character classes to get a better feel of what does what and what party make ups usually r.