Aside from sitting in front of a microphone a transducer pickup is the best option for amplifying a classical guitar. The disk of wood, housing a “pickup,” sticks to the top of your guitar near the bridge. It’s held in place by a special glue-putty that allows you to slowly pull it off when you want. You can of curse use put it on and remove it as many times as you want. However, from personal experience I can tell you that it can sl;ghtly mar the finish where its stuck to. I would not use it on an extremely expensive guitar.
Depending upon the quality and size of your amplifier you can achieve almost all of the effects produced on a typical electric guitar. The jack plug is the same as on any electric guitar and fits any amplifier.