Hmm from that what u say u have none "main" ninjas. First better get ninja who u will make team about, like Edo Deidara, Minato jonin/HK, konan(Angel of god), *sui, edo hiruzen.

From treasures: Kushimaru, Ay3 ( U will have team with him instanly, best choose if u have no good event ninjas), Roshi (He works fine with sailor sakura), Han ( same as Roshi. but more op :D), auto barrier ninjas from 5 kage.

In future best ninjas will be edo hiruzen, konan (angel of god), kakuru EG, minato jonin(with bond skill), ay4 with skillbreak

Hope this help!