Need some help with an interview I am going to

No. Never ask salary on the first interview. That's like asking a girl if you can shake hands with her on the first date. If she says yes, she is a whore. How this correlates, I am not sure. But bear with me.

There could be positions where a bit of greed could be beneficial (lord knows), but that would depend upon the interviewer's viewpoint on it. Best not to risk that sort of move.

Jam it back in, in the dark.

Why they should hire you should be you buffing up your perks as a worker. Say that you feel you can bring new insight to the company or yadda yadda. When I apply around for a data processor, I tout my boat experience, since probably less than 1% of all processors have experience in the field :V

Strength/weaknesses, you pick something that can be good for your weakness. Like say you will pay very, very close attention to detail, although sometimes a little excessively. Worst case scenario, they'd think you are a bit slower of a worker than average folk, but you are far more careful.

There's nowhere I can't reach.