1) Creating two groups; one of regular users and one for VIP users. All users automatically get placed into the regular group. From the admin a customer will be made VIP by changing their group. In the admin under Customers, Edit and Group under Options with a drop down (Regular User; VIP user)
After loggin into the frontent all VIP users will see a different price based upon a fixed percentage discount that applies for all prices. Add this discount rate into the admin under Configuration, My Store.
2) In the administration area provide the ability to upload a scanned delivery note with each order that was placed. and allow the customer to view this by clicking a link when viewing their order named "View Delivery Note"