Just max out your whole Heavy Armour perk tree, maximize Smithing(only the heavy armors, don't go near the light armors; they're useless), maximize the 'Armsman' perk in the One-Handed perk tree(to gain maximum attack), spend points in Illusion until you reach the perk which silences your spells, get the first 2 or 3 perks from Restoration to maximize your healing powers if you need them in an emergency (don't forget to get the one that automatically heals you to 250 hp if your close to death or something, that perk can be a real life saver) and last but not least; spend points in Stealth to get the damage modifiers( e.g. the dagger modifier that increases your damage by 15 times etc.) and your pickpocket skill(who just doesn't love pickpocketing?!). The rest can be put in any skill tree you want, but Block would most probably be the most beneficial one at this case. Oh, and it doesn't matter what order you do them in. Cheers!