Not really sure what to provide I'm not great with TVs...what do you need to know?
Actually, you find this info yourself as long as the TV is a mainstream brand. i.e. Samsung, Panasonic, Sony etc and not Techwood/Technika/Hokey-Cokey
Either read your manual or go to the manufacturer's support site and get the info from there. What you're looking for is whether the TV supports streaming via the network connection. If as youu say you're building a PC then you'll be used to reading manual and understanding what works with what.
A TV is no different.
So, streaming is like file and printer sharing on a PC. This is not the same as playing media files off a USB drive. That's something different. If there's no Ethernet port or Wi-Fi feature then your TV will not support streamed content. That's dead simple and it means you need an outboard box (WD TV Live or Boxee or similar) to do the streaming playback. If your TV does support streaming then the next thing to find out is what file formats it can cope with. Since you can't dump new CODECs on a TV then you're stuck with whatever support is built in to the telly. Find the supported file formats and make sure that you either rip to or convert existing files to those that are supported.
So, to recap..... Has the TV got some sort of network connection?
> No - go buy a streaming player.
>Yes - go find out what file formats it supports.