If you can, feed the power from a "star" point near the regulator and power caps. This hopefully stops any noise generated in the digital part from being transmitted through the analogue side. Consider feeding analogue through a ferrite bead if it is going to be noise sensitive. Obviously fit 100nF caps close to the power pins on any ICs you use.
In this instance, maybe consider using a separate regulator for anlogue and digital sides perhaps? Unless you know what you are doing, use a simple flooded plane ground. Splitting it can help control the currents flowing through it, but you really need experience to know where to put it, or to be able to model the specific pcb.