Hi NikeKoh,
I am not sure if you mean as to start the lit search or to write one up. Usually I guess supervisors just send you off to research one a specific field to find out what research is out there. A really great tip passed to me was to sign up to the RSS feeds of relevent journals. That way you can keep up to date with published research.
I would prob start by just outlining the research problem, why it's important, what contributions different models or explanations make and the problems with these. Its really easy to get side tracked. I do all the time, so try and stay focused on the research question. Don't worry too much about it as the orginal lit search will change drastically as your project develops. But if you want help with the writing there are some excellent books about writing a thesis. Try amazon. For general style etc Joseph William's Style: 10 lessons in clarity and grace....is really good.
Hope it helps?