You can import any torrent file that points to a media file. You should make sure you have diffusion rights over the content it points to, otherwise it could cause legal trouble to yourself and your instance.
Put your instance on the public PeerTube index: <x id="START_LINK" ctype="x-a" equiv-text="<a href="https://instances.joinpeertube.org/instances">"/>https://instances.joinpeertube.org/instances<x id="CLOSE_LINK" ctype="x-a" equiv-text="</a>"/>
Choosing your <x id="START_TAG_STRONG" ctype="x-strong" equiv-text="<strong>"/>instance name<x id="CLOSE_TAG_STRONG" ctype="x-strong" equiv-text="</strong>"/>, <x id="START_TAG_STRONG" ctype="x-strong" equiv-text="<strong>"/>setting up a description<x id="CLOSE_TAG_STRONG" ctype="x-strong" equiv-text="</strong>"/>, specifying <x id="START_TAG_STRONG" ctype="x-strong" equiv-text="<strong>"/>who you are<x id="CLOSE_TAG_STRONG" ctype="x-strong" equiv-text="</strong>"/>, why <x id="START_TAG_STRONG" ctype="x-strong" equiv-text="<strong>"/>you created your instance<x id="CLOSE_TAG_STRONG" ctype="x-strong" equiv-text="</strong>"/> and <x id="START_TAG_STRONG" ctype="x-strong" equiv-text="<strong>"/>how long<x id="CLOSE_TAG_STRONG" ctype="x-strong" equiv-text="</strong>"/> you plan to <x id="START_TAG_STRONG" ctype="x-strong" equiv-text="<strong>"/>maintain it<x id="CLOSE_TAG_STRONG" ctype="x-strong" equiv-text="</strong>"/> is very important for visitors to understand on what type of instance they are.