What is a good team for a genin in Naruto Arena and what are some strategies to use with it

A good team for a Genin to use in Naruto Arena is Zaku, Temari, and Ten-Ten.
They are basically all range types but they have very powerful attacks.
It's hard to make up a strategy for this type of team because its almost common-sense and also, it depends on which type of energy you get.

Another one is Sasuke, Obito, and Rin. Activate Sasuke's sharigan on whatever opponent you think is the hardest to beat. If you can't, then stall till you can by using Obito's sharigan, Obito's stab, Rin's healing etc. Then just use Sasuke and Obito on that opponent. More specifically, use Sasuke's Chidori or Lion Combo, whatever you can. Also, you can use Obito's piercing stab.

Remember to focus on your teammate's health. Use Rin to heal.