I'm in the process of building an on-line sales site, and I'm using the free PrestaShop software. I was pleased to see that it includes a number of Bitcoin specific modules - Two that take payments via the blockchain, and another that uses coinbase. There are also some wallet options, and I haven't yet looked to see if those are suitable for Bitcoin.
The promotion of Bitcoin via the increasing numbers of such sales sites will surely contribute to the growth in Bitcoin use right where it is needed - international sales,and low cost sales by small retailers.
Thats good to know that Prestashop offering or having support on bitcoin. Keep us informed here about your site, and hope you can provide advice regarding the implementation of it. Its also a good to aspiring web developer who are into bitcoins as bitcoin is an additional avenue as mode of payment.