The following links provide some good material for helping with this part of the coursework.
Spartacus Site - This takes you straight to the page on Haig. It gives an overview of his a career, and has a large number of hyper-links within the text. It is followed by a good selection of sources.
Greenhead College - This history site has a link to some material specifically designed for students doing coursework exercises on Haig
John D Clare's 'How to do Sources' - The author of the above site has produced this short piece of advice for GCSE students about tackling sources.