In order to roughly calculate the budget and timing of an eCommerce project development, you will need to report the following:
The scope of the product: What tools and functions are required for the eCommerce site?
The number of products and categories: How many products will be listed on the site and how many categories will they be organized into?
Design and branding: Will the project require custom design work or will it use pre-existing templates? Will the project require branding work?
Platform and technology: What platform and technology will be applied to build the eCommerce site?
Integration with other systems: Will the eCommerce website should be connected to other systems such as a CRM, inventory management, or accounting program?