Vivinavi

Procedures for Returning Home Permanently

I am a green card holder and plan to return to my country permanently in the near future. I was wondering if anyone knows about the procedures （ before and after returning home ） such as relinquishing permanent residence, reporting to IRS, etc. ？
If there are any professionals, I would like to ask for advice and procedures. I would like to consult with a professional and ask him or her for help.