Well, let's just run down the very basic things about orchids, then to the more specific.
First of all, your plants want bright light, but no direct afternoon sunlight. An east window is very nice, a south window is great as long as the light doesn't hit the plant directly. West windows may spell doom.
Orchids don't like to sit in water. The way to water one of these plants is to run warmish water over the roots and potting medium -- usually bark or moss -- until everything is nice and damp. As you do this, the water should be freely running out of the bottom of the pot. The plant's roots require both moisture and air, so you want to be sure not to leave them sodden.
The plant with the roots growing out of it looks like this one? This plant likes brighter light and a warmer environment.
Do any of the plants have leaves like this? This is a very easy plant, and extremely forgiving. It can take a cooler environment and lower light. As a rule, though, warm temps and bright light is good for orchids.
Hit me with specific questions. If you haven't had any spikes or flowers in a year, then we can discuss how to fertilize orchids.