I am afraid not about the individual episodes for old series'. But if you just leave your computer running for like 2 days it will just download them all.
Speed varies per torrent, if under a section saying seeders there is a big number e.g over 50 then it will go very fast. But basically. You download an application called Utorrent from here:
http://www.utorrent.com/
Once that is installed like a usual application. Click the bit on the piratebay website that says download torrent. Then a really small file will download quickly. You then drag the file that has the ending '.torrent' into the utorrent application and just wait then until it says 100%
But if you sign up to this completely safe website for free (requires email and a password) called
www.thebox.bz it has all the BB series'.
Hope that helps. If you get stuck just ask more. If you look on youtube: 'how to torrent on utorrent', demonstration/instruction videos will show you how to simply do it.