I am realizing I am way outside of my depth and my father told me to leverage this forum. I am a middle school student trying to make a mirror for a school project.

I have found a pi 3 version b I got off craigslist. I have downloaded the mirror os and written it to the sd card. I have successfully booted and logged into the system but I can not get the mirror to start and I am finding it difficult to traverse the documents and dont understand how it works. Can someone assist me and give me specific instructions on how to start it and configure a few modules? I am stuck and am ashamed to tell you how much time I have spent working on this. I feel so stupid. Please help me. I am desperate. I could pay someone a moderate amount of money from my babysitting money. I dont have much. But I know everyone’s time is valuable. Please help