Sourcerer: fire, air, water and earth magic, light magic or dark magic, id item, id monster alchemy (no black potions though), staff or dagger.

Monk: unarmed, dodging, some disarm trap, some body mind and spirit magic.

Thief: disarm, sword or dagger, basic elemental magic, some perception some unarmed and dodging.

Archer: basically useless class (IMO) but if you want perception thats the one to bring.

All classes have enough bow skill.

This is mostly the recommended first party, except that the K has been exchanged for the somewhat more interesting M.

I wouldn't use that gang unless I'm experimenting with something new, my favourites are CSSD, CSST and CSDT. I prefer magic.