The iOS version of Apple's Pages will open Word documents on an iPad. Purchase it from the iTunes app store. There are a number of other apps that can open them as well. They, too, can be found at the iTunes app store.
As for transferring documents from the computer to the iPad read your user guide: iPad iOS 4 user guide.
There is no Finder or equivalent, you don't import anything directly into the iPad. It will always be carried or ported in by some app (Mail, DropBox, Evernote, Pages, whatever) or be transferred in using the file transfer function in iTunes.
One you have it on the iPad any number of apps or readers will able to open/view it, a smaller number to edit it.