As from my experience, only few indicators could be useful.
Moving average. The SMA 200 on daily shows the general trend. I had several experiments with EMA 9 and EMA 30 on 5 minutes charts, but there were no sufficient results.
RSI. Sometimes it works for commodities like Gold or Oil. But there should be no any news, otherwise there would be a trend movement.
VWAP. It is not for Forex, but for stocks, but it works as support/resistance level. Actulally, professional stock traders use VWAP as only indicator for daytrading.
If you are interested in indicators, try to find the book “Technical Analysis” by S.Achelis, it covers all the questions related. You can also make your own research on indicator-based strategies using backtesting software (like Forex Tester, or something similar to it). Such strategies work independently of market conditions, so the resulst of backtesting will be relevant.