Hello and welcome to JustAnswer!
Do you get one single loud click from the engine compartment when you try to start the engine?
Was the car running fine when you parked it?
Do you have nice bright headlights?
Do you have a voltmeter to test with?
Ok. Try moving the shifter and see if it will start in neutral, put it back up in park and retry it. If that doesn't help, lets see if there are any trouble codes stored.
Cycle the key from off to on three times without starting the engine, and the last time leave it on. Watch the digital odometer display. The codes start with a p and have four numbers, there may be more than one code. Write down any that you see and post them here and I'll tell you where to go from there.
The smaller clicks you hear, do they happen when you turn the key on, or do you get a fast click-click-click-click for as long as you hold the key in the crank position?