watch a lot of english speaking movies, series, shows (TV)
listen a lot of music ( then search the lyrics on the web and try to understand'em)
try to learn phrases and not only words
pay attention to the correct pronunciation ( whether you want to speak like in the UK, USA, AUS )
ask people who speaks fluently
and don't take yourself so seriously it's OK to make mistakes, be easy when your friend laugh at what you say!!!