Sonny is leaving the Reservation to go search for his mother so he can get his mother to sign so he can join the Army. Sonny left in the middle of the night from his uncles house and his uncle is telling him that his mother wont sign the form. His uncle is also offering him a ride to NYC.
Sonny is training to Box.
Sonny arrived in NYC in search of his mother so he can get her to sign his Army form. While on the way Stick and Doll walked up to him because he doesnt look like he is from around there. They introduce themselves and get food, Sonny likes Doll. They end up getting Sonny to move drugs for them upstate and Sonny gets busted. 
Sonny is Boxing.
Sonny got arrested and is in the jail when they are trying to shave his hair off so he knocks out the guard. Sonny gets put into isolation, Brooks gets him out of it, Sonny is told to join a gang to survive. Sonny gets out of isolation and everyone is praising Sonny. Sonny is offered to join a gang, he refuses and gets jumped and stabbed. 
Sonny wants revenge. 
Sonny gets out of jail and is going to the reservation to train to be a Running Brave. Sonny is still sore from the jail stabbing. While training one day, a limo pulls up and its his mother and her new boyfriend. Sonny's mother doesnt want him to be a boxer or a running brave, She wants him to move to Phoenix with her. So he runs away and goes to Donatellis gym to be trained to be a Boxer. 
Sonny went up against a Pro boxer without any knowledge and he won the sparring session. Soon Sonny is Boxing like crazy and is also winning all the fights that he is in. He undefeated in all of his fights. Doll also came to see him box at one of his fights. 
Sonny goes to fight another person and he isnt allowed into the place to fight he was disqualified for being a pro. Sonny wants revenge on whoever told the officials that he wasnt. Brooks got shot also and he think he knows who shot him. Sonny goes to kill Stick and his inner self stops him from doing that and he ends up putting Stick in Jail and he goes to fight some more.