sounds like the battery has had it as that is a sure sign of not enough voltage for the starter motor to function properly. It will make a clicking sound (loud) as the solenoid runs back and forth on the starter motor.
did you just recharge the battery after standing all that time? you can check the battery by applying 'jump' leads when you try ans start it. If it starts normally simple, renew battery. If teh new battery show sighns of same after a week or so check teh alternator and make sure oyu have no current being drawn when ignition is off. (eg a boot light left on or interior lamp etc )
franklin
February 2008