First off, you're asking in the wrong place, while I know from previous threads that there are several serious/pro photographers on here like me, but you can learn a lot more, and get more opinions (notice I said opinions not answers) on any photography website\forum then here. Especially one that knows the specific gear you are using.
Check out some of these sites:
www.Cambridgeincolour.com <- I might start here if I was you, lots of great technical articles to help you understand how a digital SLR works, and what all the setting effect.
www.Dpreview.com <- they will have forum specific to your camera and lenses.
www.Luminouslandscape.com <- hundreds of helpful learning articles, reviews, and a helpful general forum
www.SLRgear.com <- best site I know for lens reviews
www.dxo.com <- they have a good system for evaluating sensor quality.
www.Imagining-resource.com <- more good articles and reviews
www.Photosig.com <- good place to put your work up for critique if you dare.
Also find a forum that is Canon specific, I'm sure there are several of them. I don't shoot Canon so I don't know them though.
In general though I can tell you this. Practically any DSLR sensor is capable of capturing great images provided you; A) know how to use it, B) have the artistic skills and C) have a decent lens in front of the sensor. Learn how to shoot using manual ISO, aperture priority, shutter priority, and full manual when necessary and you will have more control over the image them just using the "P" or auto mode.
I don't know exactly what lens you have, BUT in general the "kit lenses" that come with a beginner SLR kit are the bottom of the barrel. If you want the best results possible invest in some nice lenses, and it is an investment as they will long outlast today's digital bodies.
Also I recommend turning off all the "scene settings" that effect jpegs and shooting in RAW (I'm sure others will disagree, it's controversial) it means more work for you in post (get Lightroom or another good RAW converter), but it also allows you to make use of ALL the data the sensor recorded, not just what made it through the jpeg compression.
With digital I've learned the importance of ETTR or "Expose to the Right"as well. Luminous Landscape has a couple articles about why.
Lastly let me say that if you seriously get into photography, your wallet will not be happy.