House Seller - Sells house to civilian and others.(Can be Buisiness seller or both)
Car Seller - Sells car.
Pilot parachute - Flies where people want to go and then, they jump of the plane (or Helicopter) and the pilot goes back to airport.
Secret Agent - An agent with a sniper and some teleport (checkpoints or he can just has a helicoter) on some building to kill
(If he's a good Agent) 1: Deathmatch killer. and
(If he's a bad Agent) 2: Kill civilian and good people walking down the streets.
It only depends what you want on the server, a good Agent or Bad one.
Disco Stu -
(Joke)
Naval jobs - Marines, Naval cop, show of stuntman in boat (put some jumps in the water), snorkelers (works for the CIA).
I don't have any other idea, I hope this will help you
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This isn't for Jobs.
For the license school, you can do the exam in the real GTA:SA.
Start at the school, drive to a checkpoint to another and another and come back to school without damaging your car. So if there is 0 Driving teacher, you can gain your driving license. So i vote for no Driving teacher job, and a /sdriving command to teleport at the school.