Virgin Seat Selection

Hello
I have a flight booked on VS5/6 for March next year.
I am just wondering if anyone knows how Seat Selection works. On the website it says a selection of seats become available 90 days prior. Do you have to pay to select your seat at this point or is it free?
Furthermore, if I were to book Extra Legroom seats what are the chances of myself and my friend being allocated window and middle seat? (3-4-3 747 config) I would hate to get the middle and aisle seats.
Finally, anyone know what side of the plane is best to sit at on Little Red flights into LHR for the best views?
Sorry for all the questions
Thanks
Zack
I have a flight booked on VS5/6 for March next year.
I am just wondering if anyone knows how Seat Selection works. On the website it says a selection of seats become available 90 days prior. Do you have to pay to select your seat at this point or is it free?
Furthermore, if I were to book Extra Legroom seats what are the chances of myself and my friend being allocated window and middle seat? (3-4-3 747 config) I would hate to get the middle and aisle seats.
Finally, anyone know what side of the plane is best to sit at on Little Red flights into LHR for the best views?
Sorry for all the questions
Thanks
Zack