Should only be one small black wire connected to the back of the coil. It should also be the only wire that will disconnect from coil. The sparkplug wire will not come off coil without doing damage.
Center of coil near sparkplug wire.
Or are you talking about a car type coil?
Test for power with engine installed.
First thing to do is clean the points. Then test coil while on engine using a test light. Or, swipe the coil from your neighbors old Ford truck and see if the engine will run.