Besides DPP there is another free Raw app that is currently being offered, Phase One Express. Check out this link:
http://www.dphotographer.co.uk/captureone/
The "stuff" works, I haven't heard or seen anything about it being non-legitimate.
But, as to getting started in Raw, DPP really is quite easy to get off and running with. The "secret" is that because it is Canon software it "knows" how to read and translate all the in-camera settings. Other software, unless it is licensed by Canon, can't do this and can only make an "educated guess" about things like Picture Style and White Balance and all the other various tweaks you might make in your camera to get the jpeg shot "just right".
So, in DPP it's this simple: set your camera up to get things just the way you like them (Picture Style, White Balance, High ISO Noise Reduction, whatever) and take the shot in Raw. Load it/them into DPP and voila, DPP will render the preview into an image very much like what the out-of-camera jpeg would be, and if you are happy with it/them, it is an easy thing to Convert and Save to a jpeg for any use -- smaller for the Web, larger for print, etc.
But then the power of Raw can step in here -- Raw gives you more "latitude" in adjustments that you would have with an out-of-camera jpeg. So, with the Raw file open you can freely switch around Picture Styles or White Balance, for example, without possibly causing degredation to an image that was shot in jpeg.
It can actually be fun "playing around" with this stuff as you learn. You will also begin to get an understanding of what "makes things tick" with digital imaging. And, in time, you will "know stuff" and will be able to give others pointers as well
!