Here’s a good tip.
When you’re at home, in your car, on the tube or in the train, listen to the radio, the English radio.
Like BBC world service or Radio 4 online
http://www.bbc.co.uk/radio/player/bbc_world_service
http://www.bbc.co.uk/radio/player/bbc_radio_four
You might not understand everything, but that doesn’t really matter at this stage
What matters is that your ears get attuned to the music of the English language
And once your ears get attuned to particular sounds, they’ll be able to recognise them, making it easier for you to then imitate them
You’ll get more and more familiar with word and sentence stress, rhythm and emphasis of this beautifully singing language
Remember, language is mostly about sound