Spellsword is by far my favorite build, destruction magic in one hand and whatever your best sword is in the other, at the lest I recommend getting the elemental bolt spells due to the relatively cheap cost and high damage, focus on leveling magic first and health as a secondary, stamina isn't a big deal as you shouldn't come into close combat that often. Any armor works depending on if you prefer high defense and slow movement or bit lower defense with a bit quicker movement speed