How to get a regular Job.
Start by driving to the City Hall, Located at Pershing Square (You can find it by using
/gps >> City Hall & San Andreas Government)
Then you may head to the door of the City Hall and press "F" or use /enter to enter the building. Now go into the red circle where a Dialog will pop up on your screen. Now choose what job you would like to have.
Congratulations, you have choosen a job!