new to orchids, help with fertilizer, colors of leaves and just good suggestions

[pauldog28504]

I just started getting into Orchids in the past few months. Just bought a few at lowes this past weekend at a really good price of $3.50. I am not sure what to use for fertilize b/c the tag says 20-20-20 but they don't sell that around here. I have a white haze on some leaves and did not know if i need to wipe with wet paper towel or leave it. I have one that i got to close to the window when it go cold last week and is turned yellow and brown on part of leaves. I have heard that you can use Tea on the Orchids as a fertilizer but dont know how much or how often and heave heard of using milk that has dried out. I have put 3 pics of two that i am having issues with. Please help any body

02/02/2010
I am adding more pics to this post and of my new ones i just got this weekend on one of them i pulled it out of the clay pot and it is in a clear pot and there is packing peanuts in the bottom and you can see that in one of the pic and was thinking i should take it out. i updated the pic of the one that has the brown on it and did not know if i should take the leaf off or just watch to see what it does. there is one pic that has two parts that have green leaves on it but there are two stocks that had leaves and have died off and did not know if i should cut them off