That's an excellent start. Ordinarily I'd talk to you about finding the right soil, but in this valley I'm quite sure you'll find great soil anywhere you look. So we can skip that.

[So very lucky for everyone here, given how complex trying to find good soil could become.]

Cover the roots with hay or straw for mulch, and make sure the tree is planted where it will get a great deal of sun. Apple trees want as much light as they can get.