Like Holdall said, while I have hope someone will discover some long lost mind blowing text, most of what we are getting these days are clarifications/tweaks/connections of and between texts we are already aware of.
(eg: Skinner’s Ars Notoria making that system workable or that dude who showed how most likely everyone who was trying to make the near impossible all wax Almadel altar were the victims of a miss translation from a older text and most of the altar wasn’t intended to be made of wax.

)
Now as far as what you should read, really depends on what you’re comfortable with given your upbringing. I was raised Christian, still consider myself one, I pray daily, and the Bible is one of my primary working books, etc…
- If you were Catholic or Charismatic, that gives you a lot more wiggle room in certain areas than some other groups.
- Chaos Magic (Carroll linked above) can be shoe horned into almost anything (I have and still use it in a number of ways).
- Most of the trad grims are very heavily Christian, just because of the era they came out of (Planetary Angels is a pretty easy fit for example).
- I’m a huge proponent of meditation and altered states (Wachter, as linked above, for instance gives you some interesting tools to work in this area) but that’s not everyone’s cup of tea.
-Eld