General Information for handling deceased parents estate.

My father recently passed and I am trying to make sure I handle things properly for my mom. I have met with his attorney, his insurance person and have an appointment with social security in April. Any general information that you all can provide would be greatly appreciated. I am trying to avoid any pitfalls. I am helping my mom keep an eye on her accounts and pay bills as needed. She is 92 and has a hard time remembering everything. My dad was smart enough to put almost everything on auto draft.

Thanks in advance.