Think on the combat triangle (archer beats mage, mage beats warrior, warrior beats archer) make use of all three gods you have chosen (and neutral) and all their troops, dont be predictable, expand early and fast, dont fear combat, dont gather mana for kbd unless you got a great plan, remember that barbarian chieftain captures buildings twice as fast as normal barbs (not counting lvl ups) Killing an unit increases the winners strength/hp with 1, dont let the oponents get to many buildings, make use of forrests and other terrains and finally, make use of portal mages (lvl 5 neutral troops)
Some quick tips.