Beginner questions on miniature phal

[luellaorchid]

Hello!! I am a complete newbie to orchids so bare with me. I've looked up some advice online, but because I'm so new to it all, I can't make sense from some of it and just wanted some reassurance!
I was given a mini phal as a present on Saturday, it's my first orchid. Hopefully the attached pictures will work - I have two queries, the first being that one of the flowers has gone crispy and shriveled - why is this? Is it it's natural time to fall off or am I neglecting it in some way? And secondly, one of the roots seems brown but isn't spongy - once again, am I neglecting it or is this OK? Does it look healthy in general? Sorry for being completely clueless
If anyone has any tips on how I can look after it best I'd really appreciate them. I have watered it once since getting it, I only gave it a little water and let it drain. On the leaflet that came with the orchid it says I should water it about once a week. I've since bought some orchid food but haven't given it any just yet. I'm moving to a new place on Sunday so I'm going to try and work out the best place to put it when I get there. Anyway, sorry for the ramble, I hope you guys can help me out!!