If you are new to this character, you will probably want to find out just what skills to expect when you start playing. Once you figure out how to use them, your time as shaman will flow a bit better. Some of the first damage spells you receive will be Brain Bursta, which is a bolt nuke, and Bunch o' Waaagh, which is a channeled nuke. You will probably find yourself using these spells over and over from level 1 until about level 15. Life Leaka deals damage over time, so that will be appropriate to use occasionally, too.
You will also obtain some healing spells at the lower levels.Gork'll Fix heals over time, while Bigger, Better, an' Greener and Divine Favor are both bigger, more effective healing spells that you get around level 10.Gedup! can resurrect a dead ally, while I'll Take Dat deals damage to an enemy while you heal.
As you climb the levels, you will receive some spells that help your entire group out. Mork's Breath clouds the vision of your enemies, and heals any allies close to them, while 'Ere We Go! increase the damage dealt by party members' melee attacks.