I probably won't be the first or last to tell you this, but practice makes perfect! Listen to it as much as you can, watch shows in English (especially cartoons that tend to have simpler language), listen to music, try to read and write it regularly! There is no fast & easy way to learn a language, so the important thing is to make it fun for yourself :)

Practice , practice , practice. That's the only way. Watch shows in English with subtitles in your language. That helps ALOT