Huntschool. I believe Dave cuts his risers 1/8-inch from center.
Given that you're probably shooting a fast flite string and that you want to shoot 145 grain heads, I'd recommend shafts spined about 45-50#. If you're going to primarily shoot targets with this bow, and want a light arrow, I'd recommend 5/16 cedar shafts. They're available in this spine weight. Surewood shafts are also excellent. Don't think they're available in 5/16 though. They'll generally be a little heavier (and tougher) than the cedars.
To determine how centershot your riser is, string the bow and view it end to end from the belly side. Line up the string with the center of the limbs and see where it bisects the arrow shelf. If your bow happens to be cut to center, add 5# to my recommendation.