New player questions--Please come help

Hi everyone, I saw this game on sale for $14.99 and after waiting months thinking it was coming to PS Plus (Like every other game that goes on sale $15 or less it seems) I just decided to go ahead and buy it instead. I am like 2+ hours in, maybe less and I have a few questions I just cannot figure out. Please keep in mind I am playing on PS5.

#1- I have picked up a few maps and journals, however I cannot do anything with them. I cant open them. When you click on them, a box comes up with " Use--Use Several--Drop--Discard" however everything is greyed out. Why is this? How do you read these maps?

#2. When will I know to use my lamp in the world? For example I keep finding "hidden eyes" or circles with my lamp where if I hold my lamp down and "extract" (IDK what it is called), these circles will bust. Does this do anything? What are these?

#3. Im sure this gets asked a lot but any other tips you have for a brand new player? I have only played Elden Ring, Remnant 2, and literally just like one or two other "souls" games.

Thanks!