I just did a mini quilt this way and forgot to take pictures before I mailed it out. I cut the backing 1" larger than the front. Trim the batting to the edge of the top. You also have to trim the corners at an angle so there is at least 1/4" of backing fabric out from the point of the corners if you are going to miter the corners. If you flat fold them you don't have to trim.
You can find tutorials on line for this method too. Be sure to post pics when finished.
peace