# Now I want

"Because of this, I want" or  "However, I want."

# is the head of

"has authority over". Paul uses "head" for authority in verse 3 and also to refer to a person's actual head in verse 4 and following. Since the verses are so close together, it is likely that Paul intentionally used "head" in this way. This would show that the ideas in these verses are connected. 

# a man is the head of a woman

"men are to have authority over women" or  "the husband is to have authority over the wife"