So, let's see, your abilities currently are:

Bar 1: Burning breath / Heroic Slash / Volatile Armor / Pierce Armor / Unstable flame / Ferocious leap
Bar 2: Stone giant / Shield charge / Defensive posture / Dragon blood / <empty> / Standard of might

You're running a stamina build, with Redguard, which is definitely great with stam DK.

I notice you haven't tried out PvP yet, however, I'd suggest you go to Cyrodiil and complete the first quest (you don't need to PvP for that), as it'll unlock 2 skill lines, including one, Assault, which has a few extremely good stamina abilities: Caltrops and Vigor.

Do note that running Sword and shield on both bars is not recommended, because of how it limits your options. You may want to consider running a 2 hander on your second for Rally (morph of Momentum) later on, which is burst heal you may want, as well as Wrecking Blow / Executioner for more single target DPS, or Dual Wield, for a more AoE oriented option (steel tornado / blade cloak).

If you want to check what the skills are available to you, you can check this website.

I'd suggest you drop a few offensive abilities on your first bar, and move a few from your second bar on this one: Stone giant and Defensive posture in particular, which will make your life a lot easier by not having to swap weapons to be able to stun someone (Shield charge is also a good replacement of Stone giant, especially for a stamina build, as it burns a lot of magicka).

Note that you get experience in various skill lines depending on the skills you use, so make sure to never have an empty skill slot.

You may want to consider getting an UI addon (AUI - Advanced UI, FTC, Lua extended...) to keep track of your DoT abilities (Burning breath and Unstable flame) and know when to reapply those.

I suggest you also check Lefty Lucy's guide to animation cancelling, because Sword and shield builds are extremely reliant on it. This will also solve a small issue I noticed: you use light and heavy attacks in succession, without using abilities multiple times. Just check the vid and you'll know why, if you still don't understand, just ask and I'll give you the full text explanation.

I couldn't have a look at your attribute points, but I suggest you focus mostly on putting them into stamina, just a few into health, and none in magicka (if they're not that way that is).

I'd be interested in knowing what Mundus you use, you may be interested in Warrior, Tower or Serpent early on.