Thanks a lot Newdigital!

I finally found some great EA's that you mentioned. However, even after I compile and try the strategy testing on them, some of them did not show any result. I checked the minimum balance and it is still sufficient, in fact when I tried to use them on live demo account, nothing happened!
No position being opened until now.

What's wrong?
Sorry to bug you with all this newbie confussion.

Thanks again!