That's actually a disturbing thought given circumstances I'm not willing to talk about...OTOH, in 2003, the "disturbing" stuff would be minimal and I was still in with the neopagan community (though it's complicated in that it's different in Buffy the Vampire Slayer, so I have to imagine them differently...and I've also dabbled with spells), which means I should be able to find my feet easily.
I'd be suspicious of Buffy, doubting her stated intent of why she activated me and the others, especially if she expected to lead us as an army. I don't work well with others that way. But as long as no one tries to put a leash on me then I can certainly do favors (including teamwork) in exchange for things I need to know, and important contacts or Slayer handbooks (unlike Buffy, I'd be very interested in that handbook if it still exists, though I'd be giving it a skeptical eye as well as I tried to discern propaganda and genuine mistakes for the truth). It's even possible that I join a small group that checks in from time to time, but it would be a certain type of people (a personality type I don't feel like explaining).
If the US government was after us (as happened in the comics, IIRC), then I'd be a lot more cozy with the main group, though even then I know that in cases like that, it's those who stay in a group mostly likely to be captured (or worse), which means I'd be ready to bail at a moment's notice (but that doesn't necessarily mean I'd abandon the others).
Beyond that, I'd fight monsters and demons (and think it actually makes sense, which it would more so because of the neopagans I knew, and likely had more direct experiences with back as a runaway, or at least knew others who did), but once I became aware that things weren't that black and white then I'd want to know more about what I was doing...I could see myself becoming a bouncer at a place like Caritas for a demon like Lorne as I tried to gain a better understanding of the demon community, because otherwise I'm no different from the rest of the feuding demons with extraordinary and supernatural abilities. This could potentially put me into opposition with Buffy and her army, but I'd be prepared to do that under the right circumstances.