Regarding grinding wheels and grits etc, Google and you can download "Advanced Grinding Practise", by Hamilton and Jones dated 1915. It's one of the classic turn of the century machinist texts relating to grinding practice. Lots of good stuff still applicable to technique and materials. I think there is a chapter or two on form grinding and tool grinding. Also two chapters relating to grinding wheels and media. Of course newer technology is around, including some decent videos on u-tube, but a lot of info in the publication is still valid.
Regards
Glenn