Start maxing out accuracy, starting with whatever affinity it helps you the most in now.

I'd go with 2-3 def% for everything

Then max out accuracy 

Then crit dmg ? Going by which affinity you have more off . Then def% max out , but idk what im talking about so take my opinion with a grain of salt !

That was my plan.  Needed to make sure its right before allocating that many resources.  

I went Accuracy, Crit Damage, Resist. There's some debate about ordering but those three are where we start, for sure. 

Yeah. I would argue ACC then CDMG, and then from there, RES for the arena affinities and DEF/HP for the CB champs.

Only think for sure is ATK is last.  I went res, acc, hp/def, cd, atk

If you are really heavy in one affinity (I was mostly blue) you could do 3 magic first. Void i would do last unless u r a whale  :)

I am reasonably split up, for champs that I use.  Blue, green, red, purple is the sequence.  

ACC

then  CDMG/RES

then  HP/ATT/DEF  I  concentrate  on  DEF.

I took my strongest champ (damage wise) and started outing crit. Dmg for his affinity. When i first started, i was pretty much "ATK oN eVeRyThiNg" so kinda messed up 20 or so points. But now focusing on ACC, RES, and DEF. I based affinities off my arena go to shortly after I pulled a Serris since the tier placement rewards are pretty decent after Gold IV.

Definitely put atleast one point in Them all to get the ones that start out at 2%, since they increase by 1% afterwards until like rank 5. Just a trivial benefit. Until you get them to 10 :)

Remember you will need at least one upgraded to Lvl 10 for Arbiter.  Thats the reason to focus on one skill and one affinty in the beginning.  

Of course. Goes without saying :)