Just to add to the last poters good advice,
Plants like some sunlight, but being in direct sunlight drys them out to fast, and it makes the flowers bloom, fade and die, too fast. It can also bring on diseases and green/white fly. If you notice any of these, go to a garden centre and they will give you the appropriate spray. Cut
Also keep them away fro Radiators, as theres too much heat.
When a flower fades, cut it off and bin it. It will help produce more flowers.
Do the same thing with the Orchid when it has finished flowering, cut it back. An Orchid can bloom for up to 6 months and it does require some plant fod in the water, while in flower. Water it much less when its not in flower. Also, dont move indoor plants around too much. If they find a place there happy in, leave them so.
Then sit back and Enjoy.