While you explore the vast world of forex indicators, here's my advice on narrowing down your search and efforts. Always keep in mind that indicators fall into one of two main categories: trend-following and oscillating. The type of signals that these two types of indicators give you are only valid if the market is doing what the indicators were designed to measure; in other words, if the market's ranging then you want to only observe your oscillators, and vice versa for trending markets. From there it becomes a matter of knowing what type of market you are in (trending or ranging), which I recommend the Advanced ADX for that.
My method of narrowing down the search was to find several technical analysts whose opinions and analyses that I trusted and then I took a look at their charts and studied the indicators that they were using. From my experience, most of the old pros use some sort of momentum indicator like the RSI, CCI, or ADX and the rest is strictly fibonacci, MA's, trendlines, support/resistance, and pivots. These sorts of things take more time to get good at than just throwing a programmed indicator on the screen and watching it for signals but they are used far more often than any single indicator, thus the market become a self-fulfilling prophesy when it comes to things like trendlines and fib levels especially when they sync up together on the charts. All I know is they work great for now, so until that changes, I'm sticking to them. Hope I helped.