First, be aware you will not see or hear them with your physical senses, but your astral ones. To put it another way, the info come in via your subconscious, and you have to train to get good communication between your conscious and subconscious minds - then the subconscious learns how to stimulate the same neurons in your brain as would be stimulated by your sense organs, and you “see” etc. But no one else will be able to.
We have a bunch of tutorial to start working in this that I already linked you, take a browse through and see what calls to you. The last think to try is evoking, and there are three good tutorials for you to try - these use pretty much the same techniques as E.A. in his Omniscience course
The first thing to get under your belt are your protections: like spiritual hygiene, then you want to get into developing your astral senses and avoiding impostors and parasites… When you can be sure you’ll not get attacked by parasites, then try Unofficial Tutorials: First Contact from Sigils to Evocation Collection.