save up your coupons to get a meta ninja. some meta ninjas are rinne sasuke, edo minato, kushina, halloween kimimaro, kakuzu egf etc. You could always check the strategy section of the forums for lineup help or to look at some teams, or you chould check some naruto online youtubers, like Kageterror, Coffin Element, Yujin Takara and more, to look at some teams they showcase for ideas of a team of your own or you can just copy the team lol. But I would advise you to collect ninjas that you aim for in events over time and save up your coupons, and finish the ninja you want with coupons, if you can do it during a week of the fuku deals event so you can get power items as well.