Nope, sorry there is no spectator mode in Battlefield 3.
Battlefield 3 has no option or game mode which allows split screen.
Yes there is no doubt about it.
no
Not legally.
No, you just have to look! Stupid!
No, the BF4 Beta is a separate download/installation.
Now
About 25 pounds.
No, you can be any age to play Battlefield 3.
Go to multiplayer on the main menu
It unlocks at 20,000 points
No you can't unfortunately.