Do a bit of preliminary research. Get potential material together and start reading. If also helps to get a thesis example that is similar to your topic. Read through these and stop ever so often in order to ask a question. The more questions you can generate form external content, the more content you can generate for your own thesis.
Finding a good thesis example is not always easy. The major point being that you need to understand the exact purpose of the thesis statement. Unless you know exactly what is required in such a writing exercise, finding a good one can be tricky.
Thesis and Thesis Examples - Stony Brook University
The example prepared is free to use and you can take advantage of as little or as much information as you would like. But remember that it is an example only. It is not your report nor is it your work so you should never try to use it that way. When used properly you can certainly find these examples that make it easier for you to write your paper the right way.