Here, "the King" is another title for the Son of Man. Jesus was referring to himself in the third person. Alternate translation: "I, the King, ... my right hand" (See: [[rc://en/ta/man/jit/figs-123person]])
This can be stated in active form. Alternate translation: "inherit the kingdom that God has made ready for you" (See: [[rc://en/ta/man/jit/figs-activepassive]])
Here "kingdom" refers to God's rule as king. Alternate translation: "receive the blessings of God's rule that he has planned to give you" (See: [[rc://en/ta/man/jit/figs-metonymy]])
The author speaks of the world as if it were a building set on a foundation. Alternate translation: "since he first created the world" (See: [[rc://en/ta/man/jit/figs-metaphor]])