if you can tell us the ohms on the woofer, then it will be easier to get an amp.
for example if its a 12D2, then you can use a 4 channel amp and bridge 2 channels for a simple setup.
if not then you could use a low powered mono amp (most of them are only 2 ohms stable so you got to be careful).
therefore tell us the ohms on the woofer so we can guide you correctly