So I want to build a character who is a priest of Arkay who hates he undead, will join the Dawnguard, and eventually realize he is the Dragonborn.

What are your tips for a good witch hunter build?

Main skills: Restoration, Archery,
Minor skills: One-handed, Alchemy,

What else do you recommend?

Conjuration?
Light or Heavy armor (I lean towards light because I imagine him sneaking through crypts destroying undead, so a stealth approach calls for light armor)

Should I use block and equip him with a shield or use a spell and sword approach (restoration or destruction spell in one hand and a mace in the other)?

What are your ideas?

Thanks!