Welcome to the Board from Southern California!
My DD's friend made a t-shirt quilt for her mom using all the sports T-shirts of hers and her brothers - it was her first quilt and she did a fantastic job. The clue is to iron-on the stabilizer before you cut the t-shirts. Then decide the layout - do you want/need sashing? We talked about what she was doing along the way, but she did it all my herself. Her mom was over the moon with it.