The only faction that I've been able to get accepted into were the Kings and White Glove Society. I am Idolized by many, but can't find any way to formally join them. Especially NCR. Anybody?

You have to follow the campaign up to entering the Strip. It should be all pretty apparent from there.

Oh, you've been on the strip.

Are you doing official quests for any of the groups? That's pretty much 'joining' them.

You can formally join the brotherhood of steel. Most everyone else you're just tagging along, but...



There's probably more minor factions you can get accepted into. With the Van Graffs, you basically become an employee (which is as far as it goes for a non-Van Graff family member).

[e] You also become a debt collector (bounty hunter) for the Garretts. And Francine says you can come back for more jobs from time to time.