Basically if you hear a click click noise it is the battery is flat and needs a recharge, I think it is best to start at the basics first before looking any further
The voltage of a fully charged battery is about 13volts, make sure you have the terminals clean and that you do not have the green/white fluffy stuff on the terminals, if the terminals are looking bad grab some baking soda and sprinkle on the terminals and wash off with hot water, make sure the vent caps are in place and secure.
The starter motor is located on the lower part of the engine next to the gearbox bell housing.
A good check for the battery is to turn on the head lamps and see if they go dim after a few seconds and it may be that you need to replace the battery with a new one, they generally only last at most about 4 years, if the battery is OK the headlights should stay bright for longer than a few seconds.
Pay to get the battery checked first before exploring any further..
(IMG:
style_emoticons/default/innocent.gif)