Hi Mike
All you need is some suitable recording software (I use GarageBand, which comes with Mac computers, but many use Audacity, which is freely downloadable) and a mike. You *can* get away with using your computer's internal mike, but you get better results with a separate one. I use a Samson G-Track USB mike that does away with the need for a separate mixer:
http://www.gear4music.com/inventory-detail...Bi0mZL_AyDfv5ARI like SoundLantern as it's quick and easy to upload mp3 files. I don't own a digicam, so YouTube is a non-starter for me.
There are online forums dedicated to both GarageBand and Audacity recording, if you encounter any problems. Go on, have a go!