I bought a few bowl blanks off of ebay. They arrived and are covered in some kind of wax. Do I try to hand scrape the wax off first or what? Any suggestions for my first turning would be appreciated. I have watched a lot of videos on youtube and they all seem a little different. How should I attach the blank to the lathe to begin? I have a screw for the chuck and a spur center. Does it matter which to use? If I used the screw what size hole would I drill? Thanks