It won't turn over, but I can hear a " click click click when I turn the key.

battery may be new - but i'd check it for proper charge.

If the clicking sound is coming from the starter motor then you are not getting sufficient voltage to the starter. You will need to check for voltage drop between the battery and starter. Check cables and clamps for corrosion and ground cables between engine and chassis. If you don't find a voltage drop then the starter may be bad.