The Protective Circle is for the most part depending on the individual.
The Circle is importent for protection against any negitive forces or energy.
There are a number of different ways to create your circle..
you can walk around your intended position heal to toe for 3 full
circles speaking"let no negitive energy enter this circle,
any that is within must leave"
you can draw a circle with salt. (a little messy)
use a ritual dagger to trace the circle.
Visualize the white light enveloping you for protective purposes.
There are other ways but for the most part those are the most commen.