This book might help you
101 Tough Conversations to Have with Employees: A Manager's Guide to Addressing Performance, Conduct, and Discipline Challenges https://smile.amazon.com/dp/B07KDZBQ5T/ref=cm_sw_r_cp_apan_XS073SSMAXN2M3FMVHR1
Key things to remember * use the employee handbook or policies as much as possible for employee relations issues * focus on keeping things confidential * make employees feel heard, but remain noncommittal until you have facts * use managers to manage their departments, you facilitate and provide guidance * document the hell out of everything, using specific quotes and EE statements
It's hard to do ER without experience so look for seminars and trainings that the company can pay for.