its kind of the pointer of a tracker, they're tracking announces.

it should, might take awhile, might depend if your system is reachable from the internet. if the tracker can't reach your node it might not advertise the torrent because it can't confirm that people will be able to download it.

It depends. Some trackers will automatically add newly announced torrents. Some won't. In either case, adding them directly to the tracker is quicker.