With an orc go for a stamina dragonknight.
Invest in dualwield, 2h and bow. Use your class abilities for buffs (igneous shield, volentile armor, dragon scale's etc) I prefer leveling medium armor since its a good boost for stamina and weapons damage etc..
Orc dragonknight is actually a very good combo for a stamina dragonknight at end game !

I have an Orc DK and I run Dual Wield and 2 Handed with bow as a third back up weapon, also have one hand and shield for off-tanking. I wear 2 heavy and the rest medium. It's a fun build even though not many DK abilities are used.

I run 5pc Morkuldin, 2pc Nights Silence, 3pc agility and 2pc Endurance, of course this will probably change when TG drops. I also have a few pcs of the Ashen Grip set for a different build. I have all attributes in stamina which gives me around 33-34k stamina (not a min maxer) weapon damage unbuffed in 2750 (buffed it's 3200) and crit is 31%.

I would also go onto Tamriel Foundry and look up some build ideas, best to not completely steal the build but get some ideas and put your own spin on it.

tamrielfoundry.com/forum/classes/dragonknight-class/

And if im looking towards dps build, should i invest points into the ardent flame skill tree?