If your are only hearing 1 click, you most likely have the common worn starter solenoid contacts problem. You can easily varify this (and get your car started at the same time). Have someone hold the key in the start position while you go under the hood and tap the starter's solenoid with a wrench or a small hammer. Give it agood tap but don't try to break it. If the car now cranks and starts, you have varified the starter has worn solenoid contacts. Then do a search on this forum for "starter contacts" and read up on the problem and it's cures. It has been covered here numerous times.
Mike
Mike