You can make agreements and pacts with other spirits, in the sense that you are also a spirit, but typically, it’s a “till death do us part” situation at most. Agreements made at the spirit level don’t have to be honoured when human, they’re optional.
Yes, for this kind of thing: building a successful career and opening up opportunities, I work with Ant’harratu from the Book of Azazel by E.A. Koetting. Empire building is what it’s called in that book, but what that looks like is directed by your heart.
It does help to know what you want though. Wishy washy intention makes for wishy washy results.
Lucifuge Rofocale is also a good go-to for this one.