#1
can you plug a acoustic electric guitar into any amp or does it have to be a specific kind??
#2
I play an Ibanez electric acoustic guitar through a vox valvetronix almost everyday. If your electronics are good, or if you keep the volume on your guitar under a certain amount, you'll get no feedback at all.
#4
Distortion? I would stay away from doing that. Your ears are going to get raped if you try that. A lot of negative feedback will occur. You can add other effects to it like Phaser, Flanger, Chorus, Delay, reverb without getting any feedback