Build an Online Store

Hello, I need a professional website to sell online goods of my business criteria. I need it's in simple look but in modern accessable user friendly interface. There need a shopping cart on the right side on the site also there need Facebook/Gmail login system to make it easiest for the user. The main focus that am expecting on the admin panel. I need it's in very simple but with Flexible user menu and button. Never forget you need to make its with php base custom CMS. Further and more discussion I could do with pmb. Regards :!