What if 6 members say guilty and 6 say not guilty?

Answer 1

That is known as a "Deadlocked" or a "Hung Jury." The judge will usually reiterate his instructions to the jury - instruct them in the applicable portions of the law - and send them back to deliberate further. In the final analysis if the jury remains deadlocked a "mis-trial" will be declared. And a new trial will be scheduled.

Answer 2

If even 1 juror says that the accused is innocent, the accused is deemed innocent. If 6 jurors say guilty and 6 say innocent then the accused is considered innocent.