Here is the 2nd mission of San Andreas Stories, titled Emmet's training.

Plot:
After the incident earlier that day, you decide to get some rest for the big day tomorrow. While walking home from the liquor store, Sweet phones CJ and tells him that if he plans to go with them to take over Glen Park, he must work on his aim and his skills with shooting. CJ goes to Emmet's Yard and talks to Emmet, shooting with him. After CJ goes through a difficult training session with the old man, the Ballas ambush CJ for killing the ones that sprayed the tag a couple hours ago. They fail, and instead, get killed. Emmet decides that there's too much heat around his place, and ditches the scene with CJ. CJ hops on the back and shoots at the Ballas driving after him in anger and kills the rest of the following ambushers. Emmet drops CJ off at Grove Street, and they both split up to avoid further attacks. CJ calls Sweet and tells him that he shot guns with Emmet, and Sweet is pleased, telling CJ to go use the rest of his time for a long sleep, so he is prepared for the next day.