$5 Walmart Orchid Diagnosis

[sahn30]

Hello! I am completely new to orchids and new to this forum as well. please help

So I always wanted an orchid...but I thought they were pretty expensive. but a week ago I found a beautiful white orchid on sale at walmart! I immediately bought it and I'm so happy to own one.

it is labeled phalaenopsis, and it had one damaged leaf and one yellowed leaf. I cut both out with sterile scissors and now it is left with 2 somewhat healthy leaves. I noticed that the leaves are more yellow-greenish than other orchids at walmart. I placed it near the east side windowsill and leave it under direct sunlight. I did not fully water it yet, though I misted the expise roots a little.
I checked the root condition by digging the moss a little bit, and there is a lot of roots, but most of them are damaged (not from my digging) but still green, so I left them.

I noticed that since the day of my purchase (a week ago) the lastest flower curled up a little bit and I'm noticing the crown side of both leaves turning yellowish. I can see that inside of the pot, it still has some moisture from walmart people watering it the day when I bought it.

I attached the photo of the leaves. am I not watering it enough or giving it too much sunlight?