since I read your other thread about big uns...
I give you some tips out of my experience.. I started with the exact same mindset: choose BO, go 2hd.
reconsider for the upcoming sc grind brawler + Down ya go or Brawler + boss till snare tactic. don't spam aoe (waaagh) in sc's.
you want anyway two tactics from that tree (brawler) for 2hd.
playing aoe specc in small scale will result in pain (for you, cause 0 kill potential and for your team (not that usefull, sorry to say

). since you play a aoe spec be at least mindful with it, otherwise you will break a lot of your teams staggers.
for your gear question go for dom gloves belt boots, try to get BL going as soon as it's back for good resistances, parry, procc, str on the set . and get the winds imp ToK set to bolster your resistances even further. on top of that rank 1 or rank 2 FS. otherwise you are a crit benchmark on two legs. You can use the 3 mentioned dom pieces even for your snb gear. they are a solid choice and really excel in smallscale snb.
on top of that, I don't want to tell you how to play, but be aware of the fact that volgos suggested weapon doing 69.x dmg per second (Axe is called "Bane" for greenskins). the so called "upgrades" give 79.x dmg. you will play a looooong time with that piece of equipment. the subjugator one hander has 55 dps, the dps sc I one hander is also good for dmg and the advantage of wearing a shield which brings access to block, most potent defensive stat in the game. on top of that you got access to a tactic (10%) block which is worth 20RR. Besides that, every tank in the games has access to defensive abilities. BO has 0 of that besides challenge and a stance toggle to greenest. (speaking 2hd, ofc with shield HTL, with masteries 50% block ability etc.)
from my personal experience, I just can tell you it isn't worth it.
and if I would do again such a equipping process, eg. dps dok, you would see me carry that chalice around till I got my last piece of gear.
So even 2hd would be my main target again, I would do the grind on snb to higher my sc winchances for effiency.
atm. I'm building again on my lul dps 2hd set. will see how it works... my intention tells me it will be straight underwhelming,... as always if I get out a 2hd on my blorc.
perhabs my best tip out of endless sc journey on 2hd.... work constantly on your snb gear too. you will have a hard time finding groups as a 2hd BO for anything. On BO, if your group is inexperienced, it will furthermore add instability, cause you are hard to heal.
so just a friendly warning, don't want you to rage quit. because I tried the same, just without bossspecc.
I tried really to be diplomatic, and I don't want to tell you how to play, but take my experience into your consideration.
If you still want to go on, check Volgos youtube.
He has some guides for 2hd tanks n stuff, lots of it is for IB, but many things can just be adapted to 2hd BO. He is a good starting point in terms of tutorials etc.