Consider it “advanced” and put it aside, learn the basics of magick, DEFINITELY get your protections in place as a first step because that books going to need it, and circle back around to that book when you can open it and you know from experience with other ceremonial systems what it means.
The old Necronomicon does certainly work. As Mulberry has said it all depends on you. I can also tell you that Solomonic Magick also works from personal experience decades ago. That is really all there was before Chaos Magick and Spare was rediscovered.
If you want a ceremonial flavour to your magick, I highly recommend getting a copy of EA Koetting’s early book, Works of Darkness. It has a basic evocation method that is simple and direct, and one I continue to use to this day.,