3-Some doesn't take just anyone into their employ. The player will be hired as a temporary enforcer to see what the player is made of. The player will be sent out on a caravan trip, similar to the craven action in the original Fallout, and upon their safe return, the player will get the offer for full-time employment.
Character type completion breakdown
Combat, Diplomacy, Stealth, Science Boy - If you can fight your way out of a paper bag, you should be able to handle the first, newbie caravan mission.