How Can I Convert a Cable Outlet for Ethernet Use?

I'm not really a tech expert, so I'm hoping for some guidance here. I recently moved my computer to a different room where I don't have access to an Ethernet connection. As a result, my PC is struggling with frame drops while gaming, and I realize this is likely due to the lack of a wired connection. I'm looking for advice on how to convert the cable outlet in that room to work with Ethernet, or if I'll need to hire a technician to handle any necessary changes in the wiring.