Maybe one months notice? As for the daycare in your new area, well I'd set it up and advertise, but its all in what you are okay with, tell parents that you are new to the area and moving in... I am sure they'd be cool with that--

When I was advertising for my daycare I hadn't opened yet so some things were set up and others were not, I told them that they could stop in at any time once I was opened to check out the play area and most were happy with this.

Good Luck! Where ya moving?