give out trading system is easy, but the problem is just here: they will not trust it.
why ? trading is a gambling game. or in a civilized word, it is an odd's game. 80% time works, 20% needs proper risk control. people will not buy it, they want the holy grail:the perfect one or the secret code.
actually all trading ideas are common sense.
the most useful one is: buy low and sell high, it not always works, but based on the gambling odd, it favors people in the long run if you can handle those days which it does not work.
others involve trend following, breakout or resistance/support play, or fundamental trend(become better and better or worse and worse). they all work well most time, but 20~30% time the trend you followed is fake, or the breakout is a trap, or the technical support/resistance is none....
I look through lots of trader's trading methods, when put theirs into exam, I found they are all the same, just the ways different. like champion trader martiin schwartz, he do did averaging down trading (in hist first option trading), he picked bottom (think too low) and shorted top (think too high) to lose almost 0.8m in a day.
I realized this several months ago, I start to gain. I forget about thinking about the system. but I do hone my skills on any trading strategy, so I can make money every day ( it is not realistic, but 90% of time should be). since in some days, if you are just good at buying low/sell high, the day may be a trending day, your skills are not good enough, you need switch.
Quote from TraderZones:
It is not impossible, but far harder than most will grasp. Many of those claiming success cannot distinguish paper/sim trading from real money. Or that making money for 3 months means anything, etc.
Someone published a thread recently - maybe a month ago? that said for a very long time period studies, the number of traders who did well was like 3%, and half of them were clearly attributable to luck.
there are a few trade auditing sites - timertrac, timerdigest, futurestruth, attain, striker and others. One of them says "Over the past seven years, we have audited over 11,311 trading strategies. " Want to guess how many of those strategies has much value currently? Maybe 1 or 2... And their history is not very long.