In a mainly physical team the wizard is kind of more a liability than a help sadly. His job will be mostly supporting the other with buffs and displacing the enemies.
Go purely damage with your archer and always try to get for high spots with skills like tactical retreat. Job of the archer is to get the armor down, job of the rogue and tank is mainly assist with taking armor down and afterwards keeping them on the ground with skills like battlestomp. Displacement skills like teleport will be your best friend on pretty much every character. If there to many enemies just throw one or two far away or put them into your 'doom zone', so physical AoE attacks can more easily hit more than one at a time.
Warfare and Earth magic are probably the best for the tank, so he can prepare explosive fields for the mage and replenish armor. For the rogue scoundrel, warfare and polymorph. Even a skill like Medusas Head is nice against enemies who start with hardly any or even no magic armor at all.
