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1) Don't worry about the fingerprinting appointment. Let that run normally. But if the interview for the AOS comes before you resolve the DUI, then you will want to reschedule that interview.
2) They should not deny you for 1 simple DUI. The problem is that they will not approve you until the DUI is closed because they want to see that you handle it correctly. So that's why it is important to reschedule if you have not closed the case yet. They will want certified copies of the police report and the court disposition (how the case ended).
3) And no, a denial of the I-485 does not result in a denial of the H1B. But if you are passed the 6th year of the H1B, you would not be able to extend again.
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