A few more points to add to what has already been said (I concur!). None have anything to do with the camera, lenses, or accessories you use may use to take photos, but they all are critical for good results:
1. Good editing software is almost as important as the camera you use. Photoshop is the one most selected, but is pricey and getting very bloated as well, IMO. Photoshop Elements is enough for basic manipulations and is far cheaper. Beware though, you may be forced to upgrade as you change computers and operating systems, and that ain't free. I use the freeware program GIMP.
2. Organizing, importing, and backing up your photos are all very important as well. I'm in idiot, so I just use iPhoto which handles the importing and organizing. Backing up is critical since hard drives just love to die. Get yourself at least one external drive, the bigger the better, and use that for backup only. Ideally, you should have the original data on one drive, the back up on another, and a third back up at another locale in case of disaster. Once your library starts to get over 10,000 shots you'll begin to understand why all this is important!
3. A good sized, properly adjusted monitor is critical as well since that is where you'll be doing all your work. Needless to say, small screens, dirty screens, slow processors, etc. all will work against your efforts.
One comment about the camera, don't worry too much about getting attached to it, especially if you get an entry level DSLR, they are designed to take around 20 or 25 thousand shots then kaput! My first Rebel lasted for 5 years and I got about 22,000 clicks before it said sayonara. I was pretty hard on it though...