Advice for new Paladin

[Affliction]

Hello,

I just finished the game on Normal difficulty, playing Warrior. I had great fun. My army consisted of Hunters, Knights, Horsemen, Guardsmen and Emerald Dragons. Overall, I didn't have much trouble defeating even "overpowering" armies. I found that I had enough runes to spend on almost all skills I wanted (everything but Dark Commander in Might tree, extra leadership, xp, reserves and some more in Mind, lvl 3 Order and Distortion + some more in Magic tree). I really enjoyed Spirits of Rage - at the end of game, Stone guy (forgot his name) was lvl 30 and my favorite, Death, was lvl 28.

Now I'm considering playing a Paladin on Hard and one thing that I really wanted was an undead army, especially considering Dark Commander seems like one of the most powerful talents. Now, I realize Skeleton Archers are lvl 1 units and as such, very prone easy to die. I also probably wouldn't use Bone Dragons, but some other (Emerald are really cool because of that mana drain spell). Ghosts seem an ok unit and Dark Knights even more so. So, would it be viable at all to invest into Dark Commander simply because of these few units?

If we neglect all that, what are generally good talents for paladin class?

Thank you for your time!