if im being honest i think ur efforts would be best aimed at dragons lair still, dragon will provide more early game items ur going to get more use out of (life steal sets and speed sets etc) than fireknight will, but if you really insist on farming it then high khatun as lead role will make a huge difference for you in the early stages of it, u should also aim to acend ur champions as it unlocks ring/amulet/banner slots etc.

high khatun lead (gear her well enough to survive, this champion is also easily worth lvl 50 minimum, has great use early game/midgame)

ronda

artak

sycl 

kael

focus most progreession towards scyl/artak/ronda and get high khatun to lvl 50 and u will have an ok enough team to progress a decent bit more into the game for a while, but again i really think dragons lair is the better option for you early instead of fire knight, which means getting kael to 50 at least for his psn will also be useful to you.

I agree that with that team the OP should be able to progress quite a bit further with development but would you leave Stag Knight just waiting in the wings? Seems like an easy champion to book and get survivability and a damage boost. 

OP even if you do not develop them early on make sure you hold onto Genbo and Stag. They are champions you will regret you sacrificed later if you do so. 

Since Ronda is alreay ready to go to 60 I think I would build my team as..

High K

Ronda

Stag 

Sycl

Kael

I would think with that team you should be able to survive long enough to take Fire Knight 7 down. 

i completely missed his stag when going glancing through, but ya 100% stag is worth taking to 6 star you will be using him in most content. i did notice genbo and he should 100% be ready to get this guy into his arena team i just feel most early game play its best to leave pvp champions until a bit later down the road.

Stag for sure to 6star, I would vault genbo as just an arena specialist should not be an early game focus.

Artak, stag, scyl (don't book)

Zelotah is a great og support epic, also doesn't need any books.  

I left Artak off for FK because he is awesome fully filled out but it will take you a long time to get him to that point. That said, he will make your farming campaign a lot less painful.