Identify a problem worth investigating.
It should include some information about your research goals, and how you plan to approach them.
The introduction chapter can contain specific objectives. However, they can also be saved to be used later on after you have provided background information about the topic and the state of current research.
The Introduction chapter typically concludes with a description of the structure of the thesis and identification of specific chapters or appendices.
Chapter one is the best. It defines the problem areas and gives an overview of your work. Chapter two describes why you did what you did in the context of previous knowledge. Chapter three explains how you did what you did and four explains what you discovered. Chapter five tells you what it all means.