Bitcoin Information

Alright, I have been looking into bitcoins lately, and noticed that they fluctuate about 5% a day in their value, and I would like to start looking more deeply into them, However, information seems to be hard to find, therefor, I was wondering if anyone on here ever traded them ?

My Questions would be :

How do you buy them, and how quickly can you find a seller ?
How do you sell them, and how quickly can you find a buyer ?
What trading platform is used ?
How are they converted into actual $ ?
What are the fees applied to transactions ?
Do I need to go thru a broker ?
Where can I find an accurate chart of the fluctuation ?

Any other information would be nice to have as well.