# Blessed is the coming kingdom of our father David

"Blessed be the coming of your kingdom" or "May God bless you as you rule your coming kingdom"

# of our father David

"of the greatest descendant of our father David" or "that David's greatest descendant will rule" 

# Hosanna in the highest

Possible meanings are 1) "Praise God who is in heaven" or 2) "Let those who are in heaven shout 'Hosanna'."

# the highest

"the highest heaven" or "heaven"