Nothing super magical about flying wings when it comes to models. I have built several flying wings and deltas. Some had airfoils specifically designed for aircraft without tails, others were built from standard airfoils like a Clark Y design. I can honestly say they each work about the same. Some are a little better than others, but I have basically seen that they will all work. Just do what Ed sais, balance about 10-15% for the first flight and reflex both ailerons/elevons up some. As you get comfortable flying it, you can move the CG back. Good luck...