When you cast a circle, it is always a good idea to request assistance and support from the four elements, as well as the Divine Spirit (or the God and Goddess, depending on your personal beliefs).
I have here a nice generic Quarter Call that you can use for most circumstances :
Face the East :
We call upon the Ancient Air of Wisdom to bless us with clarity of thought and guided wisdom so that we may perceive what is real from what is false.
Welcome to our circle
Face the South:
We call upon the Ancient Fire energy, which which comes from the core of our planet to ignite the seeds of productivity within our soul and bring energy, passion and forcefullness into our lives
Welcome to our circle
Face the West:
We call on the Ancient Waters that encircle our world and ask that you shower us with your compassion, empathy and love. Like the rains that fall to nourish the world, may our hearts also be nourished and made whole.
Welcome to our circle.
Face the North:
We call on the Ancient Strength of our Mother Earth, the bedrock beneath our feet that grounds us in all that we do. Fill us with fortitude, strength and resilience as we move forward through our life's journey.
Welcome to our circle
Face the center:
We call upon the Spirit Eternal, the loving and creative force of all things so that we may come to understand our place in Your Cosmic plan and flow with the Cycles ot Time
Welcome to our circle.
When your work or meditation is completed don't forget to thank Spirit and the elements for their support and protection before you close your circle.
Blessed Be!
M&M