jbrit,
Your questions are not stupid. They are very well spoken and well thought out.
In most places teachers are mandated by law to file a report. Depending on your location, different things can happen from there. Most likely what will happen is you would be interviewed by a very kind and considerate person who has professional training in working with young people who have traumatic things happen in their lives.
Also in most locations the child or teen who reports abuse is considered to be "at risk" if the abuser lives in the same home. What that means is the abuser is required to live elsewhere. In some cases the person who reports he/she has been abused is placed in foster care.
Some times, tho not always, a medical examination is asked for. I'm not sure whether it is required. I think you can refuse the examination if you wanted to, but it may make it more difficult to get the abuser removed from the home.
I'm not sure what the site policy is regarding people who participate in this forum, but the people who run this website are very protective of those who come here with problems like yours.
I also want to tell you that I admire your courage in coming here and asking these questions. This couldn't have been an easy thing for you to do, and I want to honor you for doing so.
Keep talking to us, Friend.
Safe hugs,
John