E-commerce for digital products

An online digital platform where artists, musicians and authors could upload their own content and sell them online. I am looking for a long term business partnership with the developer. So please give me a reasonable price to move forward together. The website will basically consist of 3 parts as below; --- 1- Front store: retail store where the products are displayed, featured and can be bought by visitors. 2- Content owner panel: where the approved artists, record labels, upload, manage and submit their content to be sold on front store. 3- Main admin: where the site administrator can manage both the front store or the content owner's panel. Front store functions: --- Simple and easy design, should not look like just another ready-made random website. Some colour and personality should be added. Powerful and easy search engine Main homepage Category homepage Product detail page Commenting on products and rating Related products People who bought/viewed this product also bought/viewed. Search query page The product lists created by search should have options to be viewed in grid or list view, as well as sorted by alphabetical order, best selling, price lowest to highest, newest to oldest vice versa etc. Featured products, editor's choice, most sold this week, etc. options should be included in the front page. Help page Frequently Asked Questions page Genre homepage (for example under music category; rock music homepage, pop music homepage) Artist, author, musician homepage where the related products will be displayed - this pages should have unique look for each artist. Gift cards, coupons, vouchers can be bought for a friend to shop in the store. Content owner panel functions: --- The homepage of content owner panel should be different for different categories (such as music uploader should have different options than a book uploader) Basic options should be like as below: Create a new release > Fill in all the release details > "Submit for approval" or "save for later" to edit and work upon the details. Sales, revenue activity report about each product and also in total (music album 1, music album 2, total sales report etc.) There should be limitations when the content owner tries to upload something different than the site's standards (For example if we specify the album artwork for 1000x1000 jpg format no bigger than 4mb, the uploader should not be allowed to upload any other formats, types). Release title, picture, and content fields, price tag, release date, sales date copyright info and alik forms etc. should be filled by the uploader before submitting for approval. (I will provide this details for each specific category -music-video-book- once we negotiated.) Search in releases - to find and re-edit. Search in pre-released products which are previously saved for later to work upon on it. Able to edit artist page - header image. can create different users under their accounts to help them with content uploads, etc. Content owner can also be a distributor who enter different labels' products in one account therefore the products should also have label information. Main admin: --- Whole control Advance search through products Able to edit every single detail on products submited. Able to edit every content owner account Should have levels for different administrator roles Manage featured products, best-sellers etc. Able to create "product lists under a title and description" and shared through the front-store (for example: 100 best new year songs or best 20 gifts for her etc.) End-user should be able to --- Comment Rate Complain Buy (once bought a product should be able to download that product from 5 different devices but should not be able to share to other devices). Create wish list, Create their favourite lists