You should read the manual for basic party creation info. Your classic combination is good. Of course there are better options but then it wouldn`t be so interesting to play the game with best possible party.

Also install this unofficial patch if it isn`t already included with GOG version.
http://sites.google.com/site/sergroj/mm

Might and Magic games aren`t classic dungeon crawlers like Legend of Grimrock. You should try some other games like Stonekeep, Anvil of Dawn or even older games like Eye of the Beholder 1&2, Dungeon Master and Lands of Lore: Throne of Chaos.