research method

As I am a relatively new investor like Wilson, I too am learning heaps from forums like HotCopper and elsewhere on the net. Such as stop losses, CFD's etc.
one method I have been playing with is supply and demand.
Before the market opens I total up the amount of shares to be bought and sold (the next 10 price levels) and divide these into each other to give a ratio.
At the moment the buyers outway the sellers by a ratio of 1.46/1 which indicates to me a rise in the share price is on the cards.
I find it easier to copy the market depth and paste it into Excel then do an autosum on the volumes.
Any thoughts on this method would be appreciated(positive or negative).
Also starting to look at CFD's but only with money I can afford to lose such as $2,000 to start with.