Your camera has a 1.6x crop sensor. It's not a full frame sized sensor, so what ever lenses you choose, you must multiply the focal length to get a more accurate picture of what the field of view (FOV) of that lens is.
For example, if you choose a 35mm lens, it does NOT give you a FOV as that of a 35mm lens simply because the smaller sensor 'crops' the image by 1.6x. Put a 35mm lense on your camera and it does not give you wide angle results. Instead, it behaves like a 56mm normal lens.
Cameras with smaller (than 35mm) sensors will always have this magnification effect. Great for telephoto applications, but bad news if you need to go wide, which is why manufacturers started developing the super-wide angle lenses that go down to 10mm.
Hope this helps. Also, do a search on the internet about the basics of DSLR cameras to get a better understanding of your tools.