Hello guys, please i need help

I would like to integrate some workflows where if an agent identifies a new customer and inputs their contact details as a lead, an automated email is sent to the customer and then 3days later, a follow-up mail is sent as well.

I have checked the internal workflow, but i cant find something of such.

I also want to create workflows on escalated tickets from intercom and its sent to slack channel directly for bug reports, Automating first response time and resolution time.