I will only tell you this: You have to find your own way.
I may go with some reading materials, but not use them, or go with a journal and not write.
The very first time I went to adoration, I just felt a call to go, and a prompting to take a journal of some sort. I grabbed one, got there, and felt prompted to write. So I did…and I was surprised by what came out of my hand.
So be open. Pray to the Holy Spirit before you go. If you fee drawn to a particular book, then grab it. It’s ok if you end up not reading it. Bring a journal or notepad, in case you are inspired to jot someting down. Bring a rosary.
Most importantly, just be thre, and let Jesus do the talking. You may be amazed by what he says and how he says it.