apple cuttings are doable but grafting will have vastly better success rate. for cuttings, it’s usually hardwood cuttings taken in early winter. bottom heat/cool tips but keep them from freezing - you need them to grow
roots before even thinking about leaves. then once there are roots, transplant out in spring to start leaves.
my warning is just that cuttings from apples are not really entry-level cuttings. there are a lot of things that propagate easier from cuttings than apple, which is why grafting is frequently the recommended method for apple.