I haven't heard of any right or wrong way to applique. For me, I like to sew 2 pcs together face to face all around, then snip the back to turn the piece & stitch close to the edge to sew it on my project. Like the others have told you, it's personal preference & the look you're going for. My quilts get washed a lot so my way has to stand up well for that purpose. Good luck, hope we get to see your project!