New Moon
When he became a werewolf
A werewolf.
which side Bella goes on werewolf or vampire
When Jacob finds out he is a werewolf, we has to say away from Bella for a while, so Bella was hurt that she was all alone.
No. He doesn't turn until New Moon.
Chapter 12. Intruder, page 258.
No
Jacob is a werewolf. Technically, he does not become a werewolf until the second novel, New Moon, and he remains a werewolf for the rest of the series.
Jacob has to turn into a wolf. Not a werewolf because werewolfs can only turn during a full moon.
In the book Bella describes him as a huge shaggy russet coloured wolf.
The first time Jacob Black turned into a wolf was during New Moon, sometime after he and Bella went to the cinema in Port Angeles where his symptoms became more prevalent.