Ehh, he’s involved with the deeply fascistic Order of Nine Angles so I’d avoid him. I tend to find Genesis 3 to be an excellent starting point, and I have a podcast coming out in the near future on the subject, actually just a lot of the book of Genesis, and the Book of Enoch (Apocrypha). After that I’d reccomend books on early modern witch hunting (like the Compendium Maleficarum) and the Zohar, as well as the Treatise on the Left Emanation, the Lesser Key Of Solomon (I reccomend against using those particular rituals to summon demons as they involve a lot of binding and commanding and that generally offends them), also there’s loads of great Biblical Apocrypha out there, especially Thunder Perfect Mind. There isn’t really a good central text for a left-wing Luciferianism… or Luciferianism in general TBH aside from biblical writings, and it’s a decentralized faith without a set doctrine so it’s primarily about figuring out what Lucifer means to you and what texts you regard as authoritative.
I’m also a fan of Baudelaire’s Litanies of Satan, and Milton’s Paradise Lost, and various other literary/pop cultural/folkloric depictions of Satan. I primarily read Hermetic literature and Christian theology (including heretical) along with a lot of witchcraft literature to get an idea of the… historical depictions of Lucifer.
Welcome! I have a whole reading list page on my blog. Enjoy!