white fuzzy spots on orchid roots

[plantgirl22]

hi!!! so I got my first orchid plant and its not doing too good :/
about 2/3 weeks ago there were some roots sticking out of the top and I cut them off before I knew what I was doing (they were white and I thought they were dead, later read that its perfectly normal) and shortly after the flowers started turning brown.
a few days ago the roots were getting white again so I sprayed some plant food I got from the store (miracle grow for orchids), watered her, and they turned green again except now there's a couple white fuzzy spots growing on the roots. I read it could be snow mold or a fungus and I don't want to treat her incorrectly again so if you have an idea what it is and how to treat it please let me know!
also, I want to repot her, I read they like clear plastic pots best, I was wondering would a small glass jar work as well or do they need a drain hole? do they prefer gravel on the bottom or top or none at all?

thank you so much in advance :-)