Sweet phones Carl to inform him of his mother's tragic death. Carl begins a journey back to Los Santos. He is greeted by Officer Tenpenny, a corrupt cop who has been bullying CJ since before his leave for Liberty City. Tenpenny and his fellow officers, Pulaski and Hernandez, take Carl for a ride. Carl claims that he is clean -- that he is no longer involved with gangs. The officers want something from CJ but when they want it, they will find him. Meanwhile, CJ is thrown from a moving car into Front Yard Ballas territory, a close rival of Grove Street's. Hop on the BMX bicycle in front of you. Begin pedalling, tapping 'X' rapidly to build up momentum. Cycle to the Johnson house by following the 'CJ' icon on the radar. Enter the red marker to trigger the cutscene and the starting mission.
There is no need to get on the bike if you don't really want to. Before you continue with the story, grab a car and start running over some Ballas gang members. When you kill them, most of them should drop 9mm pistols and occasionally Micro-SMG's so jump out of your car and collect, rinse, repeat. Gun ammo will come in handy so collect before you progress. Running gang members down is a safe method as they will not shoot back at you if you do so.