Hello, I would recommending re-visiting materials that should have been supplied by your University as to how to structure your dissertation as different institutions can sometimes differ in their dissertation requirements. Alternatively, I'd recommend contacting the dissertation module leader and informing them that you are struggling to contact your supervisor as although they are probably busy, they should be making time to answer your queries. Another suggestion could be contacting other students in your University that are completing a dissertation and asking them where to locate the materials that you require, or watching dissertation tips on YouTube for general advice.
Lauren
Wrexham University