Does Bill have permission to slip you vague facts about your previous self or world?: SURE but enjoy looking up the canon because it's so obscure 8'D
Is there anything specific you would like him to focus on?: I WILL PROBABLY PP YOU IF SOMETHING COMES UP but generally /shrug
Can Bill mention any random details of your world to someone else? : GO AHEAD
Is there anything you absolutely do NOT want him to know: nah can't think of anything