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It is important to say that their is no meaning to aim for developing Siddhi. Doing so demonstrate that you are on the wrong way and therefore it will take much more time to reach them. Siddhi are fruits on the path.
Doing things with Astral body is possible for anyone, since it is just a part of yourself. The point is to get a part big enough of your conscience to go with it.
This as nothing to do with meditation or Buddhism. To have a good mediation it is more important to be here and now, well centered, and therefore with your astral body inside. Nowadays, most of the person have their astral body somewhere else (high astral, low, or around).
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The Visuddhimagga covers the topic of paranormal powers quite extensively. A prerequisite for any, however, is a mastery of the rupa and arupa jhanas. You've got a long road ahead of you with that! ;-) And figure that by the time you get there, you'll probably have lost interest in siddhis anyway.