1. I know this has elsewhere been mentioned to be in Corvus's journals which Bellatrix did read when she was recovering. So the information is out there.
2. Not getting curses is an admirably goal.
3. Depending on how you want to proceed with Item 3 and that much information, Tairith's uncle (?) owns Borgins & Burkes and Rabastan (and Peter) more recently went a field trip there. Rodolphus may be sharing the information about the latter soon. Depending on how much he would want to reach out to Nott, he might have further insight on cursed objects.