I read over the rules for Necromunda and the game looks amazing, but I have a couple questions...

1 Are single gang vs gang (not campaign ) games played, and what diferentiates the gangs in those games given that they have the same stat line.

2 If I put a ganger on overwatch, and in the arch of fire there is a hidden enemy, at the beging of his turn when the hidden rule automaticaly goes away, can I shoot at him ?

3 Can I sustain fire on over watch ?