Hi there,
The first one looks a little like it might be in the Croton family, but I'm not certain. The 2nd is Sansaveria (Sp?) aka "mother-in-laws tongue" or 'snake plant' and the last one is sometimes referred to as Dumb cane (or corn plant, but that's pretty generic). If you google those you should be able to get cultural requirements. Dumb cane gets it's name because it causes the mouth to go numb if chewed or eaten. Not sure about toxicological factors on those.
