Building a tank really isn't very hard in ESO, because unlike DPS or healing "tanking" isnt really measured by any sort of number. At least not one that most other players would noticably recognize.

Since you only have five abilities in ESO try to keep the following in mind while choosing your tank abilities.

1) You will need a taunt.
2) Your job is to protect your group. You need some way to help mitigate damage to them. For DK's this is usually Dark Talons. You can root many mobs in place and keep them from attacking whoever they like. There are other options, all just depends on what build you intend to go with.
3) Your secondary job is keeping yourself alive. This has more to do with your stats / gear than anything, but your abilities augment this as well. You should keep at least one ability on your bar that will keep you alive. Whether its Dragon Blood for the self healing, Obsidian Shield for group (and self) dmg shielding...Defensive Posture.. etc. Keep something on your bar that makes you harder to kill.

The other two abilities are a mix and match of one of the above 3 roles. If you feel you need more survivability, add another survival button. If you feel your not doing enough damage, add DPS.

Lastly is stats/gear. The name of the game is once again, be hard to kill. This means raising your hit points, armor, and spell resistance as high as you can.
How you increase your survivability is entirely up to you. Its not just maxing out your hit points. I've seen tanks put more focus on stamina and stamina recovery than RAW HP. This particular person gained most of his mitigation through excessive use of Shielded Assault (a charge move in the shield skills that gives you a damage shield).

How you choose to do that is entirely up to you, but I will tell you that being Khajit ..while not an extreme handicap or anything, isnt doing you any favors in the realm of tanking.

Tanking styles at this point in the game are extremely arbitrary in my opinion. So there is no one way to do it.

@ers101284b14_ESO
I do not play PVP either, but I love PVE. Thanks for the info. I have also, a DPS build (Khajiit NB) and a healer (Argonian Templar), leveling an DPS as well (Argonian Sorc) so I understand those spots in a dungeon group. I usually try to get the monsters in a small group and kite them to death (via an AOE's) if I can. Not sure, how that will work for tanking.

I keep protection/debuff on my main bar and different utility skills on the second bar. Something like: Pierce Armor, Crippling Slash, Defensive Stance, Fragmented Shield, Green Dragon Blood.
Then throw Inner Beast and Burning Talons on the other bar. Maybe Igneous Weapons if you don't have another DK buffing your group. Cinder Storm is nice.
A weapon skill or two if you use something other than 1h, but I never had much luck with bow as a secondary, so I'd keep 1h on both bars. There's quite a bit of flexibility here, depending on the fight. You'll have to find out what works for you, some encounters are best tackled with skills you rarely use elsewhere, so it's difficult to give you a universal rotation.

So health is the main stat to focus on and Stem as the 2nd stat? Leave magic alone? (I will be using Sword and Shield for close up melee and Bow for range kills) I might be thinking in terms of DPS still....

Here is a detailed link to the tank build I use. You can incorporate the bow into bar 1 but honestly it would be better to just use s/b twice in that build for the spell damage, but it will fit if you want to keep the bow. The build uses two different sets of S/B so you won't have to learn any new weapons.

The build is pretty solid and has something for every encounter along with some great group defense, excellent self defense and amazing resource management in heavy armor.

I have had a tank back when early access came out. I went from stamina base build to magika. I love my magika mixed with stamina build.

I wanted to try more than one build for a tank and still do PvP. So, I spent well amount of gold looking for a great build. In the beginning with the stamina build I could only hold 3 to 4 adds on me at once and for the boss fight it was easy to take a lot of dmg from the boss.

My build now is mixed with magika/stamina but mostly magika.
I can AOE all adds and keep them on me with no problem or even solo the adds.
Depending on the boss fight I will change out a few skills for the boss. Hard hitting boss will be more stamina skills(Pierce Armor /Deep Slash/Volatile Armor/green dragon blood/dark talons) , adds with boss more magika skills(Pierce Armor /Inhale/Volatile Armor/green dragon blood/dark talons), and boss with low damage/no adds I will have dps with taunt skills(just take out inhale replace with whip). My swap weapon holds buffs/player support abilities.(Igneous Weapons/Igneous Shield/Rapid Regeneration/Ward Ally/Illustrious Healing). This allows me to off heal as well. Pretty much what I do when I get a moment of breath I throw out buffs/heals. I pug a lot and it seems I have to dps/tank/off heal on most fights.

I would say the tank/healers are the most over worked builds out there. Good luck.