Before Anything Else , Download And Install Audacity
Download It From HERE
Audacity is multi-platform , and it's free , I recommend , if you liked the program , to donate to the audacity Development team , so they give us updates and new functions like this ! .
And you'll also need a Microphone ,
If your Computer have Built-in mic , Procced to next step
If your computer have mic port but NO built-in mic , Proceed to buy a Cheap one such as Mine
if Your computer doesn't have a mic port Nor a built-in mic , Buy a usb Analog to digital audio Adapter , Such As an iMic or something like that And a microphone