I would like some information on how I go about buying and selling
shares listed on the Hang Seng in HK. I dont know anything about the
proceedure. I dont seem to be able to find a 'real time' web site that
shows the current stock prices either. Does anybody know of a good,
easy to use, up to date site?
Do I have to go through a stock broker and if I do then what is the
usual commission etc and how long does it take to sell once I make the
decision? All my questions are fairly bacis but I am keen to learn.

Stock quotes are available on Yahoo Finance.
For example, Cathay Pacific Airlines: http://finance.yahoo.com/q?s=0293.HK&d=t

To lookup stock symbols:
http://finance.yahoo.com/l
type in company name in the Name box. In the Market box, select "World Markets".

List of Hang Seng index companies:
http://www.trahk.com.hk/eng/hsi.html