Expose yourself to English every day. The more you read and listen to English, the more familiar it will become to your ears and the better you will be able to understand it. Listen to English language radio stations, watch English language TV, rent English language movies and read English language newspapers, websites and books. You could even reset your computer's operating system to English.
Invest in a good English grammar book, and start by learning how to form the present simple tense. Then move onto the present continuous tense and then the past simple tense. In this way, gradually increase your knowledge of English grammar which, although it contains many irregularities, is far easier to learn than the grammar of many other languages. Knowing the fundamentals of how the language works will accelerate your learning. In addition, you should purchase a good bi-lingual dictionary.
Speak with English language speakers whenever you get the chance. Encourage English speaking friends or acquaintances to speak to you only in English.
Take some English lessons. A good English language teacher will conduct her class primarily in English and give you ample opportunity to speak. She will also correct any mistakes you make as well as telling you when you are speaking correctly. Alternatively, find an English speaker who wants to learn your language and conduct a language exchange where he teaches you English and you teach him your language.
Write down English vocabulary you are attempting to learn on flashcards. Keep these in your pocket to look at whenever you have a spare minute.
Travel to an English-speaking country, if possible. Such travel will provide numerous opportunities to practice and use your English. By putting yourself in situations where you have to use English --- to order drinks, check into a hotel, send a letter or to buy a train ticket for example --- your confidence in your English will rapidly increase and with it your English language ability. In addition, vocabulary and structures become imprinted on the brain when you hear them in real life situations even if they seemed impossible to remember when studying at home.