Possible problems (I can think of right now):
1. Starter
2. Starter relay
3. Clutch safety Switch
4. Wiring
5. Ignition Switch
Start with the easy.
First turn the ignition to "On", and check to see if you are getting 12 Volts to the plug on your starter.
Next, take the car out of gear and set the parking brake. Turn ignition to "on". Get under car, and remove the wiring harness plug from the starter. Now remove the positive battery cable from the starter. Touch the end of the battery cable to the contact in the starter, and you will quickly know if the starter works.
If starter is good, your problem lies between the key and the plug the plug on your wiring harness.
Next are two problem areas.
First, you mentioned not hearing a click. That already points to your starter relay in the passenger side kick panel. I believe it is a green unit. If your ignition switch and clutch safety are working, you should hear a click from that passenger floorboard area.
If no click, check to be sure you are making good contact to the clutch safety switch when you clutch pedal is fully depressed.
If so, and still no click, you can either pick one of those 3 parts to start replacing, or search for answers on how to narrow it down to 1 of the 3.