Trying to demo my bathroom for a remodel, had the P-trap snap because it was corroded. I'm left with what's below. What items do I need to repair this? I imagine I would want some PVC to Copper connector and get a PVC P-trap? But there are so many available: https://www.amazon.com/s/ref=nb_sb_noss_2?url=search-alias%3Daps&field-keywords=P-trap I have no clue what to choose.
Also there is a bolt behind that cover in the picture, but it won't budge a centimeter. I assume I would need to remove that part that is broken, but what/how do I replace it? And what should I use to unscrew it since it won't budge a tiny bit trying with pliers.