This site, In Satan's Honour | To Inspire and Encourage , has some great prayers and affirmations on it:
PRAYER FOR GUIDANCE
Teach me, Lord Satan, the knowledge of the ages
Guide me in thy wisdom
Let me feel thy presence and experience what you have for me
Don’t let me be bound by irrefutable doctrines
But lead me to true freedom
Give me the strength to leave my comfort zone
To explore that which is forbidden by those who believe they are wise
Take away the fear that binds me
Set me on my true path
But if you don’t think I am ready, let it be as a sunrise
Allow me to see your light as well as your darkness
The fullness of who you are
Satan, Melek Taus, Lucifer, Azazel
If I could have anything, it would be to know your truth
To believe in what is real
Not in someone else’s insanity
So as I walk down this narrow road
Don’t let me be discouraged
As it is you who have placed me upon it
!BESTOW UPON ME SATAN
Bestow upon me, Satan, the characteristics of the Dragon
Overwhelming strength, vanquishing all weakness
Uncompromising power, to manifest my will
A fierce presence, in the face of my enemies
Dreadfully protective, a shield for those I care about
May its fire burn in my spirit, keeping the black flame bright
Bestow upon me, Satan, the characteristics of the Serpent
Possessing ancient wisdom, creative in my solitude
Believably cunning, so I can make my way in life
Extremely ruthless, when people attack
In constant renewal, rising each day prepared to do your work
May its venom run through my soul, till it consumes me
Bestow upon me, Satan, the characteristics of the Peacock
Prideful in appearance, always showing off my beauty
Immortal spirit, living on throughout the ages
Steadfast in everything, willing to go anywhere necessary
Regal in stature, a presence to be reckoned with
May its essence fill my body, making every step one of confidence
Bestow upon me, Satan, the characteristics of the Raven
Forever watchful, never ceasing to observe those around me
Highly intelligent, knowing what to do in every situation
A spiritual figure, so I can teach others about you
Master of death, embracing it when my time has come
May its darkness surround me, where every living being will feel you with me
Bestow upon me, Satan, the characteristics of the Goat
Stubborn in the face of adversary, never thwarted in my goals
Fearless in the face of fear, doing what others dare not
Courageous without limits, climbing every mountain in my way
Wild to the point of abandon, free to be who I am meant to be
May its energy ignite my faith and desire, forever holding high the horns of Baphomet[/i]