1) Mic in, condenser only. The "Phantom" switch is to power your microphone (if needed). IMO >90% of the time an acoustic guitar recorded Line In will not sound good. Some people advocate doing both simultaneously.
2) As few as possible. Unless you want more.
3) Depends on many factors. Usually doesn't matter. If you're sure you'll have a good setup and are willing to stay in exactly the same spot throughout your entire performance, barely moving your guitar at all, use the mic. I suggest just plugging in for convenience. Pedals if you have/want them.
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