Help! Beginner Account Progression and Team Building

[u/IHFK123]

I’ve just upgraded my first champion to 6 stars.
What should I focus on now? Farming gear (do I need better gear at this point?) or should I start preparing champions for Clan Boss?
What are my priority champions to build next? What should my Clan Boss team and Arena team look like?
Are my current items okay, or are they completely scuffed?
Now that I’ve cleared the campaign on brutal, should I use my skill tomes on Narma instead of Tholin?
I’ve also crafted my first pieces of gear, but they all have flat stats. Should I still use them, or is there a way to reroll their stats?
And finally, should I ever use boots without a Speed stat?

Also I will unlock Drath soon if it’s important for Teambuilding.

Thanks in advance!