Hi John,
It's a very simple task. If you're recording a voice solely, you could use the Samson C01u Condensor Microphone. This is ideal for you because it does not require an audio interface. It's a usb microphone, and comes with the usb cable to connect directly to your laptop / desktop. They retail new for around £70 on amazon.
In terms of software to use, i'd recommend Adobe Audition 3.0. However, if you don't want to shell out for a program like this, (which is very worthwhile) you can find plenty of alternative freewares on google for the task you're doing.
Good luck & Regards.