Read and analyze all the advertisements in as many different types of magazines you can lay your eyes on - and the ads in newspapers and billboards.
Read loads and loads of print and internet features - to be up to the second in trends and information on people, events, places, styles of writing, in the limelight.
Be even more succinct with words than you previously imagined.
Think laterally. Read Edward de Bono's "The Use of Lateral Thinking".
Listen to people. Keep an open mind and make notes what they say, if you can.
Twitter and Facebook surf.