To find biographical information about your author, begin with a reference work. Reference books and databases are great starting points for research because they give basic facts (date and place of birth, a bibliography of the author's works, etc.), overviews of topics and themes, and important contextual details. The following should give you an introduction to your subject's life and suggest avenues for further research.
Reference works can also give you the historical and cultural background you'll need to situate your author's life and works within his or her particular postcolonial context.