It's really easy to spend money. It's somewhat harder to do it intelligently. Intelligent buying implies you know exactly what it is you need and how you will use it. So all the advice above is good and useful IF you have a clear idea of what you want to do. The problem with most beginners is separating what you actually know, from what you think you know, from all kinds of mythology and wantology. And when you do that separation, the pile with what you actually know is usually pretty small. Yet that is what you need to make a good buying decision. So I will advise buying a cheap body and kit lens with enough controls (ISO, set of modes (manual, aperture priority, shutter priority), in-camera meter that can do average/spot, and AF control (so that you learn that you and the camera don't always have the same point in focus). If the body is able to save its images in RAW, so much the better. The kit lens should probably be in the 24-135 range or thereabouts so that you can experience moderate wide through moderate telephoto.
Shoot everything and anything.
Learn the basics (exposure triangle, use of aperture to control depth-of-field, use of shutter to control apprearance of movement, use of focus to direct the viewer's attention appropriately, and the use of light to highlight shape, texture, volume and mood). There are also various compositional guidelines to learn that will help in your image-making.
After a while, take stock. If you are continually stepping back because the lens is not wide enough... that's already useful info. Are you cropping your shots just to get your subject larger in the final image? Then perhaps you will want to consider a longer telephoto in your "real" system. What about low-light noise - is that something you are constantly battling with? then a camera body capable of good low-level light plus some "bright" lenses may be worth considering.
Your basic system will show you in use what you need to consider. Once you've got that under your belt, either Nikon or Canon will have systems that are excellent. But now, you will need to increase your budget, and buy into a system. That's OK, since now you have a much better idea of what you need and you'll have a better handle on the ergonomics - what feels "right".