1: don't have the link, but look for Killer Shrike's Hero Stuff
2: lots of people still play previous versions, no worries.
3: 75+75 (150) is a fine starting value. But honestly it can be any value you want.
4: If you post your characters people will definitely offer feedback.
5: I will not opine on this.
6: require all spells to take. Full Minute to activate, Gesture, Incantation, Trigger, Usable by Others.
7: Your welcome
8a: Hero alreadyin had an endurance economy, I would just ignore power points and use the hero endurance economy.
8b: I would do corruption as either a Complication or as a Side Effect. But most likely as a Side Effect.