To get started, you should first keep a log of all the important Forex Economic indicators' release dates. Keep a log or make a subscription to one of the economic journals, so you'll know the most important factors of that time. If you are trading in JPY, the Forex Economic Indicators need to be relevant to the currency type, of course.
Each economic indicator tells you about a different aspect of the economy, and this should be translated in turn into the predicted movement of the currency price. Make sure you understand which aspect the indicator is about. For example, know that the GDP measures the growth of the economy while the PPI measures inflation. Don't worry, with some experience this will come naturally.