don't think there is an actual "pact with the devil" also, someone correct me if i'm wrong, but aren't "the devil" and satan two complete different things?
as for your girlfriend and your career, you can try some of the magick on the JoS website, not sure if it's under "sex magick" but it's somewhere in there.
career wise, not too sure. like i said, im still new to all of this Zevism but you can try getting in touch with your GD (guardian demon) and choose a career that you know you are good at and happy with.
everything is all on the JoS website, just gotta take the time to read, cheers!