Actually, I am not sure about validity of M15 time frame. According to me lower time frames are not reliable to follow on! So, it would be better to trade based on higher time frame (minimum H1). By the way, I seem moving average is the most promising trading indicator, so you can try with MA. Best of luck.
In my experience the 15-minute time frame does give reliable signals, but they are signals for short-term positions. It all depends on the strategy you are using.