It's good that you haven't done any ten-pulls. If you can, save your scrolls until you get the later treasures, like Kage treasure, which opens at lv. 70. You might already know this, but it's not worth doing Seal at this point, and arguably Pain isn't worth it either. Once you get to lv. 60 you get Sage Treasure, but unless you want an Ao I wouldn't go for that now because you already have Sage.

But dude... what about the Elite Instance characters like the Sound Four? As you might've noticed, you get coupons when you get more ninjas so I'd recommend trying to get some more of the free guys. You might never use them, but it's still worth it to get all the free characters as soon as you can.

Sage Naruto is really good actually... the team you've got is pretty solid for now in my opinion. If you want a different team, you could try Sage - Ukon/Sakon - Sasuke 3*, with shark summon, any mystery and standard you want, ANBU assault, lightning sword, and clone if you can.

Characters who will be fairly useful in general: Hinata, Kabuto, Sasuke, Guy, Iruka, and Kimimaro. All of these perform pretty well generally, I think.

Concerning Bee - once they add the Jinchuuriki characters I think he becomes a lot more powerful just because of his buff. But who knows when they're going to release them... If you're up for investing for that, go ahead.

Concerning summons... just go for all of them, try and get 'em all because they'll be really helpful in teambuilding. Though I wouldn't invest into summon scrolls too much...

Hope this is kinda helpful, sorry if it's cluttered.