Smart TV

Hi folks,
I haven’t actually bought Kodi yet but looking into it but I have a few questions first.

I have a Highsense Smart TV and wish to use Kodi with this TV but I believe to use Kodi one must first have an App running on the device is this so ?

If I must have an App running or available on the device I wish to use Kodi on where can I get this App and how do I get it on my Highsense Smart TV ?

Or is the only way to use Kodi to stream from a computer or other device to the TV ?