You can find a test strategy template here. The test strategy needs to focus on finding the most important defects as early as possible, and at the lowest costs. This template uses to assist the user in preparing the layout of the document. As the file shows, you can start with a brief introduction first and outline the overview of testing strategy, and then you can give some background information, scope details and some other relevant aspects in the document. You can use this template as a draft to cerate your test strategy.