#1, score them with a nail or file or anything that will score them and break it across the work bench. Keep your eye out and find a strip mall or fast food joint that has the red pumice or lava rock for landscaping. That stuff works pretty good.
#2 See picture. This stuff is pretty cheap @ a decent hardware store. I made several points for the same handle.
#3 I don't really have a "notcher" specific yet, but I hammered my copper first and keep it cleaned up w/ a file or abrading stone.
I've been getting into abrading now and find it helpful, but I'm still poopin my pants when it comes to knapping, hope to move up to big boy diapers @ the Classic.