I'm new to setting up automation for disabling and deleting accounts in ADManager Plus

My managers have asked to automate the process for disabling inactive accounts at 90 days, but they want the users to be emailed 2 weeks (day 76 )and 1 week later (day 80) to let them know their accounts are getting disabled. Which is what I can't exactly figure out how to do what they're asking.

I thought about running a report inactive users for the last 76 days to somehow email the users,then use the same report 7 days later to email them again,

Accounts to be disabled after 90 days of inactivity (password reset) moved to a disabled accounts OU. Accounts are removed from all groups place (a tick in Clear all existing Group Memberships), hidden from Exchange GAL.