This build will take a little time to balance. First step is to get strength to 24 and faith to 12 to make use of the Zweihander and heal. Having an extra heal between fights is never a bad idea.
There are no buffs here because you are making use of resins and Devine/Occult weapons.
I tend to stick with the Pyromancer as the starting Fireball spell is very useful, plus the starting gear has extremely good value in terms of light weight defense. Great for dodging attacks and getting in and out of places for quick attacks and retreats.