I will give you the briefest explanation of what I consider the main points of astral, not etheric, projection.
1. Relax your body.
2. Relax your mind.
3. Just be, focus on the breath for a few minutes.
4. Begin to visualise a form either in front or behind you- experiment with which one is better.
5. Shift your point of view i.e. a portion of your consciousness to the imagined form.
Feel it, be within it sens eyour surroundings.
6. Open the astral double's eyes and not your physical ones- this will be the hardest part.
7. For your first experiment jst get used to walking around, some people like to do an astral form of an energy raising ritual- I use the middle pillar.
8. Will the astral double to rise thorugh the ceiling and keep on going until you happen upon a scene.
9. From there there are various things you can do, but for the first few times do this.
Read section 5 of the above.