Well, apparently there is some element of “gambling” in the stock exchange/forex, but still such events are considered to depend on economical events…so fundamental analysis + technical should help you. I guess, the biggest mistake would be trading on margin/ or at least high such.
Speaking of the gambling itself, it’s really hard to predict the outcome of a random event, if not totally impossible, but still the gambler could make decisions based on static events, rather than just watching how her/his money are getting down, due to unfavorable trend…
Last, but not least, one can’t predict economical events such as a large bank buying huge amounts of EUR/USD, thus changing the trend.
I was even thinking on how to apply, paradoxes such as Parrondo or St. Petersburg in the stock trading, but the logic behind them leads me to negative conclusions.

my opinion?
Start with gambling -> forex on low margin -> stock indices(again low margin, if any).

Thanks!

Try to always look for the competition rank, offer competitive prices against the ones that are selling the same clothes, offer deals, combined shipping and be able to attract more customers with these types of things.

http://hubpages.com/_yaans/hub/Tips-for-ensuring-a-successful-ebay-sale_1