I'D LIKE TO KNOW SOMEONE WHO CAN SUGGEST TO ME SOME KIND OF VALID TRADING SYSTEM.

You might want to check with different brokers that are running trading systems in house for their clients. Some are actually doing fairly good. I heard from Strat at http://www.teamfutures.com has as system running that is making some traders plenty happy

Check out www.spfutures.com

try oddball systems.com also checkout slidog.com

In Response To what is a successful system, I'd suggest you look at methods using natural growth and decline ratios found in nature, such as Fibonacci ratios 1.618 or lunar ratios 7...14...21...28...to predict how far a wave will expand. I've found most all other indicators based on price history is almost always too much--too late because they use man-made cycles applied to natural price cycles which don't fit. I'd like to send you some more research I've discovered how to trade mechanically with natural wave cycles if you will send me a postal address in confidence to MortonParker10@Hotmail.com.

http://www.ablesys.com

check out www.arbtrading.com for free stock trading systems.

Dear Vittoria,

trading systems are like black box simulators, in order to trade with it (in order for it to be valid),
you have to understand what happens inside the system.
And until you are looking for someone's system, you will not improve your trading. So, I would suggest that you take a look at a couple of educational websites about Trading Systems. There is one: www.k2k.com. Another one was suggested by one of my fellow workers www.tradersconsult.com. Can't say good or bad, haven't looked at the lkatter one.

Good luck.