All armor can be enchanted to have whatever you want on it. If it's cyrodiil I would recommend using as much impen as you can.. Or 5 impen 2 whatever you want. 5-1-1 is good if you have your undaunted max leveled. I don't know your class, but I wouldn't recommend 5 juli 2 kena for any pvp build personally. With very few exceptions, those being a certain player certain play style, with plenty of experience. Id say you should probably try to farm up some more cp as well. It's rough out there.

Standard drops have Magicka enchants on Light Monster Helms, Stamina on Medium and HP on Heavy. However, you can make (or someone else can make) better glyphs and enchant the helmet with whatever you like (Heavy with HP -> Heavy with Magicka)

For the most protection while wearing Light Armor, Chest should be Heavy and Legs Medium

If you want to PvE, you should wear all 7 Armor pieces with Divines while using the Thief Mundus Stone, for higher Crit Chance
If you want to PvP, at least 5 Armor Pieces should be Impenetrable (try to get 2k Crit Resist) and the other 2 either Impenetrable or Well Fitted

Edit: personally, I wouldn't recommend Julianos in PvP