Two things that I can think of checking first is the battery (try a battery out of a friends car that works) and second the starter,
Is the starter in good condition?
Has the car started for you before?
Has it had issue starting before? Is the ground/ positive lead to the starter in good condition?
Are the battery terminals clean?
I have had to replace a starter once because the alternator was not working, which lead to the car being started a lot with very little current and over use of the starter to the point it could not even be jumped. So if you get it running pull off your negitive lead and check you alternator is working
Hope some of that helped
Leon.