Water requirements of mounted Phals?

[Huntergirl]

Hi, I am very new to orchid growing. I have six orchids and most of them came with rotten roots from wherever I got them from, mainly as gifts or big box stores here in Canada. As a last ditch attempt so save two of them I have decided to mount them. I honestly have no clue what I'm doing so I'm wondering if they look okay? How often and how do I water them properly? I know they should be hung upside down aka right side up but I haven't got to that yet, for now I have them sitting on my table until I figure out how to care for them. Any advice, tips or tricks would be great. The one on the right has very few roots that are in terrible shape and I'm not sure if this will even survive.