Root, flowering, and fert. Qs

[lkg1323]

Hey all!
So I'm the usual suspect - owned a couple big box store Phals, killed them, then left orchids alone for a couple years. I'm still in love with them though, and by the courage that this board/it's wealth of info has given me - I do the only reasonable thing.. buy three species online.
I ordered a Phal (Nobby's Amy), a Bc Binosa ("kirk"), and a very young laelia purpurata werkhauseri.

The Binosa, to my surprise, had buds. I was insanely pleased/excited with this - until I inspected the plant further. There were many roots that needed to be removed, and serious mold growth on the media. There was also white spotting on the plant, with what appeared to be little clusters of white "balls". I'm hoping this is some kind of mildewing and not an infestation of sorts? Unfortunately, it was too small to get a good picture on, but it has all since been removed to the best of my ability with a swab/alcohol. What kind of problem might this be?
The real question to me is, - will the hacking of roots ruin it's flowering? Two of three beautiful flowers have been opened for 1.5-2 days, but are still not opened completely. I'm probably just worrying too much, but because I've never had an orchid bloom from bud in my care, I'm not sure how long it takes a flower to "set".

I'm also curious about some of the roots attached in image. Black, mushy roots obviously have to go - but I've also encountered some roots that aren't white, aren't black, aren't mushy, but aren't really solid either. They have some give to them, so I wasn't sure what to do with these... any help would be greatly appreciated.

My last question is about orchid ferts. I've read a lot of conversation about the ratios (and weakness) for ferts. However, as new to this as I am, I was wondering if anyone could suggest the brand of ferts they are using?

Thanks so much in advance for any and all responses - just the partially opened Binosa has made my heart flutter - I wouldn't have made the jump without seeing this board!!