Need to move on from my property manager

[Veronica Fort]

Hi,

First post here. I need to hire a new property manager due to ongoing issues with my current manager. What’s the best way to give notice to my current PM? Can I email? Do I need an official document? 

My house is vacant currently and there are no additional fees required as my contract is month to month. Is there anything else I need to consider?

ThankS