Involve yourself around English every day and every time of the day and use it everyday with someone!
"Firstly, I would suggest getting a teacher. If this is not something you are willing to do (for whatever reason), it may be an idea to watch english movies, write paragraphs and get them corrected on here or find someone who would have a 50/50 language exchange with you. :)"English" should always be spelt with a capital letter!
You should practice all the time with different topics (Novels, newspaper, technology, history...)