The best thing I can suggest is attempt to speak to anyone you know who speaks English and to read news magazines, newspapers, and easier novels or books. Tourist in your city are a good source of people who speak English, engage them in a conversation - they will not mind you making a mistake or so and hopefully you don't mind being corrected from time to time.
English English is a bit difference in pronunciatjion than American English. In the US, we have an abundance of accents and pronunciations. Occasionally I visit a friend in Italy and he has a lot of problems with my accent because I don't sound like a news reporter on CNN. Not all, but many, news shows are hosted by Canadians or Midwestern US speakers. Canadians, excluding the French part, will speak with accents and pronunciations that we don't have in the US.
English spelling is different sometimes, like "color" in American and "colour" in England. Either will work in most cases.
news magazines from the US or England
Newspapers from the US or England
News shows on TV from both places
easier books, and speak as you read.
Although English is a language made up of words from almost everywhere, the language is basically Germanic, so if you can speak German, you can figure out what in English comes from the Germanic. The words of French or Latin origin, you should have no problem with.