I need to interject here. Do not fool yourself into thinking FOREX is easy to trade. It is influenced by a lot of major players that are trading enormous sums of money. This market dwarfs NYSE, ES, YM, and all other combined on a daily basis.
Major World Banks (BOJ for instance) will dump huge numbers on the market to control the price of YEN vs the the almighty USD.
I think you can be a successful FOREX trader, But IMO it ain't for daytrading. If you've got a big stack, do your homework and can take the ups and downs, then you have a shot at making money consistently. You better understand interest rates, current accounts and think like George Soros.
This market is affected by things that are worldly. You better understand what's going on across the big pond if you want to be successful.
Every trade has a cost as has been said here. Generally, your trade has to move 5 pips in your direction, just to break even in covering the spread. Depending on the currency, every pip is about $10. Every trade cost you $50.
FOREX is new and sexy. Everyone is calling you. Free trades, trade 24 hours, the little guy can do it now, $500 margin accounts.(up to 100:1) BEWARE.
There are only two markets that move in my opinion. US and London Sessions. US is choppy. London is better, but you have to stay up all night. Not for everybody. The Asian session trades in evening hours US time, but it is not always trending. It's like trading during the lunchtime hour on the ES.
If you are just getting started, I think it is interested to learn the story of the EURO. It hasn't been around long, but there has been a lot of money lost and made on the EUR/USD pair. I post a chart with this and you can take a look.
My advice would be to trade a mini-FOREX account initially. You can trade (1) Lot and the PIP's are only $1. Do this until you get a handle on it. You can open an account for as little as $300 to try to get the hang of it. I would suggest taking a look at FXCM as your broker. Good comany and they offer unlimited demo trading.
Also, educate yourself here. Lots of information available. Go get the book, "Electronic Currency Trading for Maximum Profit" Keith Long and Kurt Walter. This is a good start.
www.fxcm.com