After the call, you will get a new 'F' icon on your map, which represents Franklin Clinton. It'll be at the golf club.
Get to the golf club and enter the clubhouse to start the mission called On Course.
When you start the mission, you will get a cutscene where you will meet Dr. Dre for the first time.
After the cutscene ends, you will need to chase down two golfers who disrespected Dr. Dre and teach them a "lesson."
First, you need to ram into their golf carts to intimidate them. You will be able to see the intimidation bar at the bottom-right corner of your screen.
You need to ram into them just enough so they stop. Do not ram into their golf cart head-on. This can kill them, resulting in you failing the mission.
Once one of the golfers has been intimidated, move on to the next one and do the same.
The second golfer will then try to drive away from you. You will now get a notification to tail the golfer. Follow him to wherever he goes. The golfer will go to Del Perro Pier and finally stop there.
When you get there, approach the golfer, and you will need to beat him up using your golf club. Once you've beaten enough, a cutscene will initiate concluding the mission.
With the golfers dealt with, you're ready to begin the main investigation. Proceed to the Data Recovery setup mission.
