I'm going to cheat here and cut and paste something I e-mailed to a friend who was gifted a Home Depot orchid for Valentine's Day. I have several phals myself and like them very much.
Phalaenopsis are mostly epiphytic but a few are lithophytic. I actually grow both. If you were shopping at Lowes (insert your big box store of choice as they all seem to offer the same phals), I've seen them selling the epiphytic types. Those are actually easier to grow. In their native habitat, you will find them up high growing attached to trees receiving little or no direct light. In other words, they aren't terrerstrial plants that grow in soil on the ground but they grow attached to other plants just like lichen. Think tropical forests. The humidity levels are very high in tropical rainforests. If you ever want to learn how to grow a particular plant, get the scientific name of the plant and start tracking down where it comes from and that's a big help in providing you with clues.
So for this plant, you want an area that has the highest humidity in your house. You want a very bright area where the plant will not get burned by direct sunlight. Ta da! Most people take showers daily which raises humidity in a room. Bathrooms are great to grow Phals if you have a window in yours. Situate your plants some where in your bathroom where they might get some direct morning sun but definitely no afternoon sun or if they do, put up a sheer to cover the window to protect your plants from direct sunlight just as if they had a canopy of trees above them.
Most of those bagged orchid mixes are worthless but because Phals are more common, you might be in luck and you might have picked up a bag mix that might work for them. Can you tell me which brand you have and can you give me a run down on the ingredients? Do you have any marbles at home per chance?
Now mind you, this was intended for somebody else but I hung onto it because another person asked me who got one of these phals and then another one asked me so I figured it best to just hang onto the e-mail and cut and paste since there was obviously a run on phals at the big box stores.
Hope this helps. I love mine and they bloom repeatedly for me.