15 minute chart is good for scalping.
On M15 chart you can catch good 500-100 pips moves easily depending on the currency pair.
Candlestick patterns on M15 chart when combined with support and resistance can be good signals.
Read this post in which I have posted a 30 minute video tutorial that explains how to trade on M15 chart naked.
For a pair like GBPUSD, M15 chart can easily make 50-100 pips.
On a pair like EURUSD, M15 chart can make 20-40 pips.
It depends on the currency pair how much you can make on average on M15 chart.
Support and resistance are important for trading on M15 chart.
Naked trading is a powerful concept that you should master.