1. Learn the basic reading and listening abilities of English.
2. Spend at least one hour everyday listening to news or discussion programs such as NPR (National Public Radio) news or BBC (British Broadcasting Corporation; the World Service or Radio Four are best) news.
It's hard to understand what they are saying when you first begin to listen to them, but gradually you'll get used to the speed and tone. Then you can get a brief idea of what they are talking about, although you can't get the detail. You don't need to listen to the radio for an whole hour at once. It's best to spend twenty or thirty minutes on listening separately.