Well if you are just starting, I would suggest studying AP so you will be prepared.
Here are some techniques.
(Gazing Technique) Pick an object that you can view from your bed or chair. Concentrate on the object, and be completely relaxed. You will feel your eyes getting heavy, ignore this and continue to stare. Eventually your eyes will close. If you still see the object in your mind, you have succeeded. You will feel and urge to sit/stand up. Do so, and if you see your physical body sleeping it has worked. You may fall asleep a few types when doing the technique, just practice and you will eventually AP.
(Rope Technique) Lay in your bed, or sit in a chair. Completely relax your body, and DO not move. You will feel an urge to move, this is your body asking if your mind is awake. Resist the temptation. Fall into the hypnotic state (near sleep). In order to not fall asleep, focus on a object and do not let the thought slip away. If you have done the steps correctly, you should have sleep paralysis, or your body should feel heavy. You may feel intense vibrating, to buzzing sounds, and light tingling. This is a symptom to a successful AP. Do not leave when the tingling starts. That will make your AP short and blurry. When the vibrating ceases, it is time to separate. Visualize a robe dangling above you. Do not physically but mentally climb onto the rope, until you feel completely separated. Then you have Astral Projected!
I really suggest the gazing technique if you are just starting out.
If you want to find a good video of astral projection I suggest watching "Spirit Science Astral Projecting".
Hope this helps!