What does it mean when a fuse Sparks when tested with a test light?

Do you mean there was a spark from the fuse to the test light or was the spark in the fuse socket like a loose connection? Also, you say it doesn't crank; do you mean it doesn't turn over with the starter when you turn the key? If yes, does your car have the anti-theft option?
Attached is the wiring diagram for the starter circuit. Be sure the transmission is in neutral and just touch the jumper to the starter signal fuse 31. If the starter spins the circuit to it works. Next find the starter cut relay behind the dash and pull it out of its socket and touch the wire to pin 2 with the red wire with black stripe. It should turn over, that tells you the circuit from there to the starter is okay. Next take a test light and connect it to the power wire you have, put it in the terminal 3 with the blue wire with black stripe. Push the clutch in. The light should turn on if the clutch switch is working. Now take the test light and connect it to ground and hold it to pins 1 or 5 the black wire with white stripe and hit the key. The light should turn on. If it has the security system, you could jumper it by putting a wire between terminals 3 and 4. Then try the key. See if it turns over. A common issue on some imports is the clutch lever switch not being depressed because the bumper fell out of the clutch lever.

The easiest way to find a vacuum leak is to start with a cold engine and a can of engine starting spray. Start the engine and spray the fluid at the hoses and vacuum fittings around the engine compartment. Listen for the engine sound to change and look close in that area.