In case you're wondering, there is a hierarchy. On the top is Gibbs, followed by the regulars. The older ones such as Ducky are next, followed by the bouncers. After that is the level below regulars, such as McGee. Lastly are the newcomers and the younger ones.
Leroy Jethro Gibbs (Pimp)
Anthony "Tony" DiNozzo, Katelyn Todd, G. Callen (Regulars)
Donald "Ducky" Mallard, Jenny Sheppard, Henrietta "Hetty" Lange (Old Hands)
Sam Hanna, Leon Vance (Bouncers)
Abby Sciuto, Timothy McGee (New Hands)
Ziva David, Nate "Doc" Getz (Trainees)
Regulars: 6+ years and bring in the most clients
Old Hands: Been in the business a while, all set for retiring
Bouncers: some experience, usually "trainees" with extra skills
New Hands: 5+ years
Trainees: 3-5 years
Nightly escorts: under 3 years