Help Trey Build a Computer

This is kinda ridiculous and a long shot but I am doing this anyways because I need a computer for school and would also like to start streaming video games. My name is Trey I’m in grade 8 and have a mom, dad and a new baby brother. I have been planning to build a computer for a long time because I want to make money doing what I love and I am looking to put this money into university funds.