Don't worry on spending ingots for 2 star iruka. He's just fine at 2 star and the 5% bonus to stats isn't worth more power/ninjas.
Pull on Kage treasure when you can (can't recall the level requirement off the top of my head) save up until then. Don't waste on sage treasure since Ao is common in Kage and KT orochimaru is nerfed in 2.0. Get sage naruto in an event if you have to.
Kage treasure has some good ninjas for a lightning main. Switch to that. Run Iruka, 3 star sasuke, the lightning main and someone like kimimaro, kakashi or hinata. That team should get you to 55 - maybe 60 easily.