Need help with Oneworld lounge access at LAX

I’m AA PlatPro (Oneworld Emerald) and haven’t really used the lounge perks before. Can I access a Oneworld lounge at LAX even if I’m not flying international or in first? The rules online are kind of confusing.

Also, if I book on Alaska with my AA number, do I automatically get the premium seat options, or do I need to call?