Tactics for playing as the Dwarves.

and you take Stone Skin for defense? (defense perk), and for attack (speed?) or do you rely on light?

It depends on my mood.
But recently, I decided that in the Light faction, it's better to take Righteous Wrath, which gives the most important upgrades for a dwarf - both speed and punishing strike, as well as Blessing, to remove dark spells with a mass dispel.
I also came to the conclusion that against a necromancer, you can leave leadership at the advanced level and take Rune Harmony. Because I use runes often, and it turns out that morale is already above +5, and more than 5 is only needed to counter the necromancer's war cry. But if the choice is between minor skills, then you can, of course, take leadership to expert. Then, even without using runes, morale will be +4. And there are artifacts for morale on every map. So, at least +5.

Added 16 minutes later
Here, by the way, the same thing, I recently played as Ingvar against Daedra. I took this build (up to level 21):
- Expert Runes - Refined - Perfected - Completed
- Skilled Light - Blessing
- Developed Leadership - Rune Harmony
- Skilled Defense - Endurance
- Skilled Luck - Soldier's Luck
- Basics of Attack - Battle Fury

I really liked it. True, the damage was low because the attack is low, but there were no problems with darkness. And with the help of runes, everything went great.