Hi Steemx,
Everyone has their own play style, but my personal favorite template is a necro/mage. It's easy to train up and make some quick gold to get started. Add spellweaving later on if you like.
GM necro
GM magery
GM eval
GM spirit speak
Those are the essentials. Tack on whatever other skills you think would be helpful (resist, meditation, etc...) Of course later on you will also want some powerscrolls to raise certain skills above just GM.
Targeting enemies: If you're casting spells, simply target the thing you want to attack. If you're playing a fighter, go into war mode and double-click the thing you want to attack, or draw its health bar and double-click that.
Hope you like it here! Heritage is a great shard. Hit me up if you need help!