eyin4ever

I have a 1998 Lexus LS400. It has 85K miles on it now.I just bought a new battery yesterday ,I thought it will start the car when I turn the key,all I hear is this click.I tried it about 6 times.It just makes this click sound.I tried again finally it started but I have to push the car back and fort about a foot.
Can some body please let me know what is wrong with it.I'm retired person and last time I took the car for oil change and some other things they have to fix cost me about $700.00.
Thank you.