Please clear below scenario in Salesforce

Create an object named as “Flipkart” and create the below fields:

1. Item number
2. Item name
3. Price
4. Customer Name (Lookup to Account)
5. Customer Email
6. Customer Phone
7. PO Status (Order Placed, In Transit, Shipped)
8. PO Send (checkbox)

Create 20 records for the above object and write a batch which fetch all the details where PO Status is equal to Shipped and send an email to those customers where the email is not blank, in case if you didn’t found an email in Customer Email field check in related account email(create an email field in Account object) and send an email?