My first tip would be go out and shoot as much as you can.
Sounds simple but...
You will learn about what lighting conditions will produce pleasing photographs. This is key in my opinion.
Sure you can shoot RAW and spend hours fixing your mistakes, but why not learn how to get it right the first time, in your camera.
Buy one nice prime like a 50 1.8 (less than $100) or a 85 1.8. It will show you what is possible with your camera as far as sharpness. I prefer the 85 1.8 even on my crop camera (XTi).
Learn the sweet spot of your lenses. Try to shoot ISO's as low as possible. But remember slow shutter speeds will produce soft images.
Again, it's all about reading the light in a scene. You will soon be able to tell if it's even worth bringing your camera out of the bag or not just by seeing how good or poor the lighting is. Tip: Bright overcast days will be your best friend.
Good Luck!