2. He's my favourite character because I do roleplay him, he particularly loathes necromancers as they are an abomination to his god (still unsure which one that should be, any suggestions or should he just worship all nine?).
Sounds like he's probably favoured by Arkay, or perhaps just favours Arkay (learning whether he
chose or
was chosen should tell you which). He could easily work for all of the Nine, with more emphasis on Arkay's teachings. Arkay's father is Akatosh, who is also one of the chief deities found throughout Tamriel, and Talos is the ascended Tiber Septim, who of course is
very important to mortals, especially Cyrodiil, so those two would probably be important for him too.
He might even be torn over Meridia at some point, since she's associated with living energies and opposes death and the undead, but her realm is the source of many of the problems encountered while reestablishing the Knights of the Nine.
Many of my characters who worship one or more of the Nine carry
Ten Commands: Nine Divines with them for study and reflection, so he could get some inspiration from that as well. Just depends on with whom he connects -- when my dremora was banished to the realm of mortals, he eventually became a holy knight for Dibella.
OK, definitely going with Blunt, Block, Heavy Armour, Armourer, Restoration and Mysticism although having all 3 Endurance skills is a bit overkill but can't see any way round it as I need all three. Just need to choose one more from Conjuration (turn undead and bound items spells only), Speechcraft and Destruction (his holy powers allowing him to weaken his enemies armors and weapons)
How about attributes? STR/END or WIL/END?
You could replace Armourer for something else like Speechcraft, just for the mechanics (the option of getting more than +3 at level up). If you did that, you could go STR/INT. You'll want to work on increasing INT for sure, just so you're able to cast all the spells you want to. At the very least, healing others will require more magicka than you'll have if you don't work on it. Doing a little Alchemy for healing and magicka potions can help with that as well. Willpower can be worked on after INT is maxed, or close to it, so at first you'll want to focus on STR/END/INT.
For spells, the Ritual will give you Turn Undead, so no need to dabble in Conjuration at all. Other spells can be purchased from chapel healers and the Mages Guild as needed; not sure if he'd be okay with purchasing spells from other vendors, since they provide the spells for profit, rather than as a service for their faction.
He'd probably want to join the Mages Guild at some point, since they also oppose necromancy -- and YOU would want to join it so he can at least gain access to the enchanting and spellmaking altars. A big enchanted hammer that includes a Light spell would be a good weapon for a paladin; Light doesn't cause damage, but it'd be great for the aesthetics of smiting evil with a holy light. Plus, with more limited magicka, he'll have an easier time healing with custom over-time spells.