I taught my granddaughter how to sew when she was 5 years old. We used my personal sewing machine and her first project was an easy short set. I gave her one of my older machines to take home and she started making clothes for herself and her best friend. I would recommend you look at
https://teachyoutosew.com/sewing-101/ as a starting point. I get a weekly newsletter from Mayra So Sew Easy which has free patterns and projects. The only problem with the patterns is you have to print them and then tape them together but she has some really nice projects. Good luck. My granddaughter is now 29 years old and she makes clothes for her daughter and she also does quilts. She still calls me for advice when she runs into trouble and it is a common bond between us.