There are many books on the subject available. I don’t think the forum has any tutorials on it, but if you do a search you might find some recommendations.
When I’m alone in the room I do magick while sitting in front of PC. I look at spirit sigils, whisper etc. After, especially, having seen a sigil you may think of an entity, call it with your mind and communicate during the everyday life. It may be advisable to practice emptying your mind and take notes of the messages you’re possibly going to receive.
How well do you remember your dreams? That is the real question I feel. It is easy enough to call on the spirit and ask them to come to you in your dreams for whatever reason. I don’t think lucid dreaming is necessarily required though it also wouldnt hurt.
I just invoke and to curious people say that the lines subconsciously stimulate parts of the brain and is an ancient Eastern Asian meditation technique. No one really knows what sigils are anyway