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I recommend Warlord (soldier + Oathkeeper) instead if you want sword and board. The guide was written when Oathkeeper wasn’t released yet. If it has to be Deathknight I’d level with 2H Forcewave and then switch to 2H Blade Arc.
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Some AoE caster (Demolitionist or Arcanist based), Fire Strike Purifier or Primal Strike Vindicator, or something pet related, perhaps Conjurer.
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Most of my builds was levelled on hardcore with additional artifical limitations to emulate a fresh start. But I avoid actually calling them HC viable, except this one, which was initially a joke. The reason is HC viability being an experience thing. I can level to 100 with some glassy builds while beginners will die even with something that appears to be excessively durable to me.
Anyway, if you want some beginners builds you can find them there, in the first post under “Beginners Build” tab.
But if you want something that would guarantee you level 100 on HC with zero experience then you’re out of luck I’m afraid.