Emor Project » GATEWAY TO TORAT HAYIM » GATEWAY TO MITZVOT OBSERVANCE » PESACH / PASSOVER » Mekhirat Chametz
The sale of the chametz property involves many complexities in Jewish law and should be administered by a competent Rabbi.
https://www.chabad.org/holidays/passover/pesach_cdo/aid/1689/jewish/Selling-Your-Chametz.htm
https://oukosher.org/passover/articles/mechirat-chometz/
https://halachipedia.com/index.php?title=Selling_Chametz
https://torah.org/selling-of-chametz/
https://www.chabad.org/holidays/passover/sell_chometz_cdo/jewish/Sell-Your-Chametz-Online.htm