1- Is the ability to make ki balls and throw them to hurt another persons hara or tan tein possible?
2- What in the world is astral projection?
Leaving the physical body and projecting your spirit to another location. Has yet to be proven.
3- What is jing and what are its uses?
I'm lazy today. http://www.taichiamerica.com/internal%20strength.htm
4- not to sound like a DBZ fanatic, but is it possible to use ki to fly?
5- am i sounding like an idiot?
No, just uniformed.
6-how do you clear your mind?
Hard to do, harder to explain. This is where focus comes in. Try concentrating on just your breathing and don't let your mind wander off to other things.
7- im having trouble with visualization, anyone got any advice?
Visualization might not be what your having trouble with. What are you trying to visualize? If you are trying something like a kiflame by visualizing your chi as a flame it's not going to work. Some things you can't do using chi, for just visualizing in general try to focus on one thing in particular. For example, try to visualize an apple. Do you see an apple or do you see the letters APPLE? Your mind has a funny way of translating things for you sometimes. When you daydream, and everyone does, try to "see" everything in your mind, step-by-step, piece-by-piece.