Development of the Internet portal

It is necessary to develop a large Internet portal on the subject of "Mobile games and applications". The portal should contain all the functions of a regular portal: news, articles, user registration, communication between users, etc. Of the special functions: to provide a user balance system in every sense, i.e., to provide for a user balance system. Deposit and withdrawal of funds; then you need to develop something like an online store function - users should be able to post their work (apps, games, pictures, music, etc.). ) for sale, and others, must, after replenishing their balance sheet, be able to pay for the goods and immediately download them, and the funds must immediately fall on the balance sheet of the author of the work minus the system commission. The design of the site should be modern, attractive and easy to understand even the most ordinary user of the site.

It's just a general description. The full TK is still in development, but I would like to try on the cost and timing of such a project.