Help with website please!

Hello!

I am looking to sell an online workout program which consists of three phases. Upon purchasing the program, I want the customer to receive the program in three parts (three separate emails), where the first part is sent immediately after purchasing and the second and third part are scheduled to be sent 4 weeks and 8 weeks after to the customer.

Does anybody know a service which supports this?

Zapier and Mailchimp should be your solution here.