Hi,
* My proposal is depend on the layout that we will show you by designer ,it will basically image file as per your choice .
* After finalizing your design we will start app development .
* backend(database) will be on php.
*we use material design for designing and animation to make UI much better.
* we will give you update every 2-3 days.
* for further clarifications we will connect on skype .so we will be regular in touch for smooth
development.
*Atlast you have to purchase play store account which will be 25 $ for a year where you can upload
multiple products.
Regards ,
Saurabh Pandey