Tarkin 6* Challenge

I'm trying to get tarkins ship to 6* but i cant do it.
I have a gear 12 Zader and a gear 11 TFP. The rest is'nt so good.

I think my Problem is that i have no tank. i'm farming slave1 Right now.

Which tactic should i use ?

Which ships should i gear up?

https://swgoh.gg/u/hey/ships/