Choose the type of English you want to study. The two main versions that people learn are American or British English. There are grammar, spelling and pronunciation differences between these variations of English---for example, the spelling of American English's "color" versus British English's "colour." Make sure you pick one and stick with it.
Find a newspaper article online or in print, and read it aloud. If you come across a word that you cannot pronounce, stop and try to sound it out slowly. To check for accuracy, go to dictionary.com afterward, look up the word and press on the speaker icon to hear a native speaker pronounce it.
Watch movies and television in English. Refrain from putting subtitles on movies, since it will require you to concentrate twice as hard and is good practice for you to listen to native speakers speaking at a normal pace.
Converse with a language partner. Go to a local language school, and ask if there is a native English speaker who wants to learn your language in exchange. You can meet each week and dedicate half the time to English and the other half to your native tongue so that both partners benefit. Make sure that you concentrate on aspects of the English language that you are struggling with the most. For example, some people have a hard time learning English spelling, because there are silent letters, like the letter "k" in the word "knife."