Here's what you could do take the battery out and make sure you put it on a charger tester and it's 100% good and fully charged , try the battery in the car and still if it wont start try a boost.If that still ends up with just a clicking sound , remove the starter and either get it tested for free via the seller or a shop etc or connect up some jumpers cables to it , the negative to the housing of the starter , the positive to the big terminal on the starter solenoid , use a heavy big screwdriver and hold the starter down by your foot then run the screwdriver across the ignition terminal and the bigger terminal and see if it works then , if it does you know its a wiring or relay issue etc with the car.
Hope that helps and best of luck.By the way it might not hurt to go over the power junctions , battery , alternator , starter, engine block ground post and all the grounds one by one clean the studs , wire connectors , bolts , nuts etc with a wire brush and sandpaper , plus a file and be sure you check the main wires for internall corrosion etc.