You can say "¿Cómo estás, amigo?"
To say hello friend in Spanish you can say "hola amigo".
my friend = mi amigo
amigo
Amigo is one way of saying friend in Spanish. Amiga is for a girl.
"Para mi amigo/a" = For my friend
para amigo(a) = for friend (male/female)
el amigo/a
mi amigo
Amiga
a mi amigo
"All about my friend" is "Todo sobre mi amigo (amiga if feminine)" in Spanish.
The English phrase "Pray for your friend" is translated to Spanish as: "Reza por tu amigo/a." (male/female friend)