Another way to look at it, an iPad is an Apple device, but like an iPod, it is not a "computer". If you want to load software and do what is considered normal kinds of "work" (creating documents, graphics, spreadsheets, presentations, etc. then you should use a computer. An iPad is more commonly used as a device for entertainment (games, movies, photos, etc.) and quick, easy access to email and the Web.
There are hundreds of thousands of apps (Applications) of all kinds available to be downloaded via iTunes (on your computer or directly through the iPad) onto your iPad. These apps, including Apple's own iWork and iLife apps, allow people to do almost anything now on an iPad. And, it is not the same as working on a computer. Try it. You'll most likely like it.