website similar to amazon that will sell on goods on behalf of stores

General information for the website: will sell every thing and anything
Kind of development: New website from scratch
Description of requirements/features: the web site will sell goods on behalf of store owners that own their goods on the website .
store owners will upload such goods on the website so clients can buy it on line
goods will be divided into departments as amazon.

the second phase of this project will be to develop mobile app for both IOS and android but this job is only for the first phase which i s E commerce website. the second phase will be completely separate but priorities will be to companies which have such capability.

please send detailed proposal including server requirements and cost .
this project is urgent and interviews will start immediately .
Payment methods: Credit Card, Paypal
Extra notes: