Help; learning english

[chantaje]

Hi, i had a very basic english education in the past (mostly grammar) and i need to learn to speak english more or less fluently for a job. knowing that there are a lot of bilingual people here i ask your help,
can you recommend me a method to make my pronunciation better and cleaner?
what do you do to improve your pronunciation?

S!, thanks in advance

ps: i tried with youtube, there are a lot of good videos out there but it seems that dosnt help me much.