HELP! I have no idea what to do!

[AlternaPrincess]

Hello everyone!

I have had my phal orchid for about 5 months now and the last blossom just fell off a few days ago. Now I'm unsure what to do with it. I've read that I'm supposed to trim off the whole stem, or just above the last node. I trimmed off a few roots that had died (they weren't attached to the dirt - I'm not sure what it's planted in actually - they were just hanging out of the pot). The spike looks like it still has a few new nodes on it further down, but do I trim them off anyway? Do the nodes get a light brown skin above them when they're dead? I also think that the two lower leaves are dying, so I was wondering what I should do about them. I've also never fertilized it. Which fertilizer is the best? I really hope I haven't killed it - my best friend gave it to me for Valentine's Day and I'd be devastated if it died

I added some pictures of the nodes, leaves, and of a little piece of the spike that I trimmed off. I don't know if they'll help, but I need all the advice I can get!