Basic features needed for PHP script

We sell custom made Tshirts and have recently purchased this script - https://codecanyon.net/item/printpixel-a-shopping-cart-for-custom-products/9873889

Need some features added to it;

- basic CMS on first page to add logo and then some intro text underneath. Then under the designer need to add a FAQ section. All centralised.
- change payment method from bank transfer to paid via eBay. Then allow the user to enter there email for validation. Should be a section in then back end where we can enter an email, emails only allowed to be used once.
- current script says imagemagik is not working so that needs to be resolved. Probably needs pointing to the correct location.
- Finally in the admin section we need to be able to download a high quality file of what the customer has designed so that we can print it. Ideally PNG, transparent background, 600 DPI, anything that else that will make it print ready.

Needs to be done within 24 hours.