Simple Wordpress site

We need a simple website in Wordpress that will sell one video as a gift for father's day. The video can be personalized.

This is how it will work:

The client will upload some texts (messages for the father) and photos to the site
The system will send us the order with the content (photos and texts)
We integrate the photos and texts into the video
We send the final personalized video to the client (we are thinking by email+wetransfer.com but we are open to suggestions)

We have loaded Wordpress and a responsive theme we like.
This is the theme:
http://elegantthemes.com/preview/Divi/
We are not thinking of modifying the design of the theme for now. We just want the site to be built and functional using what we have.
The theme needs to show the video in a video player so that it can be stopped, replayed, etc., not as a loop in a banner (which seem a default with this theme). If you think this is not the best theme, please pick another one from elegantthemes.com as we are open to suggestions.

We also need to have the site integrated with Paypal, etc.

I am attaching an image with the structure and some wireframes with some extra info (disregard the structure of the wireframes)

We need Wordpress to keep track of the clients and their orders. YOU WILL HAVE TO SHOW US HOW IT WILL WORK.


You will see that in Wordpress we have already tried to have this implemented unsuccessfully. You can take it from there or erase everything and start from zero.

THE MOST IMPORTANT THING: WE NEED THIS DONE BY MONDAY, MARCH 10TH (4 DAYS FROM THE POSTING OF THIS JOB). MEANING, SUNDAY, MARCH 9TH, AT 8 PM (UTC/GMT +2 hours) THE SITE SHOULD BE TESTED, IT SHOULD BE WORKING PROPERLY, AND YOU SHOULD HAVE SHOWN TO US HOW TO MANAGE THE ORDERS, ETC. PLEASE MAKE SURE YOU AGREE AND UNDERSTAND THIS POINT WHEN BIDDING.

Thanks,

Fermín