If you have not had an out-of-body experience yet it may be difficult to imagine what the Astral is like.
How do you feel when you are there? Who or what will you meet? etc, etc.
Familiarity with anything makes us less nervous, less afraid, familiarity gives us more confidence. This is so important in the Astral because, as I always repeat, how we feel affects our experiences.
So the task of Stage 5 is to familiarise yourself with the Astral. This means reading books and articles, listening to audios and/or watching videos.
We are all different and our experiences may vary but there are certain similarities between what each person generally finds in the Astral.
I have made an audio of the Treatise on AP, which gives a good overview of AP.
William Buhlman’s site also has a lot of info. http://www.astralinfo.org/
Do your own research about astral projection, some of what you find will resonate some won’t. The more you focus on this subject the more you are programming your sub-conscious, the more likely you are to have an OBE.