If you're choosing a cleric... HEAL! Wear heavy armor because divine magic isn't affected by spell failure. Concentrate on maxing your heal and concentration skill... and that's about it. I have a cleric and i chose to make it a living pharmacy... and believe me, that's what groups will be expecting from you, and even more from lvl 12 and up. Forget about making a battle cleric. If you wanna have a good fighter that heals, choose a goddam light monk or efficiently multiclass your fighter into a cleric!