# the King ... his right hand

"I, the King, ... my right hand" 

# my Father

This refers to God the Father. It is best to translate “Father” with the same word that your language uses to refer to a human father.

# inherit the kingdom prepared for you

"receive the blessings of God's rule that he has planned to give you" 

# from the foundation of the world

"since he first created the world"