|If you want to go wireless in the shop, then you only have two choices, a wireless router or a wireless Access Point. A switch can't provide wireless....it can only allow you to plug mutliple wired clients in to it since it has no wireless capability by itself.|
If you have to have wireless, and since you have a cable there, I'd highly recommend using a wired solution since it provides better bandwidth and is more reliable, I would do some comparing of prices between AP's (access points) and wireless routers. You'll probably find you can buy a wireless router cheaper than an AP.
If you do buy a router, click on my name above in my repsonse and read my "how-to" guide on "adding a second router" for info on how to set it up and connect it to your existing network. You'll want to use the "LAN port to LAN port" scenario.
I hope you're using WPA-2 encryption and a strong password for your wireless network.
I still think you're better off just plugging your PC in the shop in to that cable you already have there. This requires no switch, router or AP and will give you a more reliable connection than wireless.
It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.