New player looking for tips!

Wanna preface this with saying I'm low elo so I'm sorry if any of this is just me lacking knowledge.

I recently fell in love with Jungle Diana and I was wondering if I could get some help from you guys. I've been watching videos and streams but I need some stuff spelled out for me.

• What should I ban as a jg? What kind of junglers is Diana weak to?

• Are there any fighter builds that people universally think are good? Looking for items + runes

• How should I play her in fights if I play her as a fighter? (Alternatively, if you think fighter Diana sucks: How should I play her in fights if I play her as an assassin?)

• How do I survive ulting 3-5 people of the enemy team? I feel like a sitting duck after the damage goes off. We win teamfights bc everyone else on my team just cleans up but I usually end up with my deaths matching my kills.

And just anything else you'd like to add. If anyone would just like to write a huge wall of text about her I'd also be extremely happy and grateful to read that.