You need a mage to start if you want to get stone magic. I dont think a rogue is necessary because a barbarian can do the same job. I use a Whiskas because he has the night vision trait that is handy in dungeons. I dont like the Ommpaz because it is hard to find armour.
Regardless of what you want your charactors to turn out as it is useful to make them a barbarian early for more hp. Expect at least 5 role changes. It is good to specialize in types of magic one at a time until you get the level 7 spells. Use warlock late in the game to round out your spells.
All of the above ideas are just personal choices. Every player has differant ideas and most of them work. Look at the best tips for more clues.
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