# everyone who confesses me ... I will also confess before my Father

"whoever confesses me ... I will also confess before my Father" or "if anyone confesses me ... I will also confess him before my Father"

# confesses me before men

"tells others that he is my disciple" or "acknowledges before other people that he is loyal to me"

# I will also confess before my Father who is in heaven

"I will also acknowledge before my Father who is in heaven that that person belongs to me" 

# 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.