I found a couple of four foot lengths of eighteen inch diameter White Oak for free on Craigslist. Whoever gave it away had partially split it and had layout lines on the end like they were going to do some green wood working. The ends have checked a lot but there is a lot of solid material left to rive into handles. There does still seem to be some moisture in the wood as I split new sections apart. Being my first time attempting something like this, I have a few questions. When I'm riving a piece, how big should it be relative to the final dimensions of the axe handle? Does it matter if I use sapwood or a combination of both heartwood and sapwood or should I strive to use only heartwood? Should I approach the final dimensions of my handle and then let it sit and dry before the final stock removal and hanging the head? If there are any good online resources or books with this information I'd appreciate any leads. Thanks for any advice!