JS Frontend with Wordpress Custom Plugin

I need a Wordpress plugin developed for an e-commerce site.

You need to build the plugin only for an existing e-commerce Wordpress website. You don't need to build the e-commerce website.

The e-commerce website is a personalised book customisation site.

There is 3 components to this plugin:
1. The backend setup
2. The front-end display
3. PDF generation

For each book, the following customisations are needed:
- 2 characters that can be customised (choose from boy/girl, hair color and hair style, glasses yes/no). Illustrations will be provided as layers so this is easy to change.
- Upload of a picture to be used on one of the pages (in the book set up the admin will specify spots where a picture can be uploaded).
- Personal message on the first page, including possibility of uploading another picture for this. Admin will specify a spot for this in book setup.
- Choice of 2 languages (will provide translation for each)
- Text adaptations: name of kid and name of best friend and depending on the story 1-2 other things (e.g., name of home city). The text of the story will also change whether it is a boy or a girl in terms of 'him/her, his/hers'

- The changes need to show in a live preview on the front end. This should be in HTML5, not flash.
- The book then needs to be generated as a PDF based on all users input.
- This book should then be able to be added to checkout through the e-commerce site.

Here is an example http://www.framily.de/personalisiertes-buch/ritter... (sorry it is in german)

Просьба указать сколько будет по срокам и по деньгам.Также просьба ответить на вопрос:

Can you tell me how you actually intend to do this project???