Embracing and Hugging

Q: I would like to please find out more on mu'aanaqah. Is it a sunnat? Will it be okay to conduct a lesson on it by including it under etiquettes? What is the method of performing it?

Q: When making mu'aanaqah, should one put his head to the right or left? Some people go to the left and some go to the right sometimes causes a head bump.

Q: Can siblings kiss each other just on forehead or cheeks, can I hug my sisters? We three met after 17 years.

Q: What is the ruling of hugging a friend in Islam? If I am a girl and hug my friend who is a girl too is it permissible? What about hugging your friend everyday at the time of meeting and departure?

Q: When meeting someone after a long time is it sunnat to embrace / hug one another? Is the sunnat for ones head to go towards the right hand side, what other Sunnats have been mentioned regarding the embrace with regards to hand positions etc?

Q: What is the Sunnah method of Mu'aanaqah?