If all of the devices are wireless capable you should be able to do it with a wireless router depending on the size of the shop.
Some routers have a USB port for attaching hard drives.
Minimum security should be WAP2.
The bluetooth scanner ptrobably interfaces with something else, your MAC etc as its a different wireless technology than what everything else will use.
I would invest in a high end wireless router to get better functionality.
I can recomend Cisco 800 series as you get enhanced security features etc such as firewall capabilities.
You might want to engage a local professional to sort it all out for you but they aren’t cheap.