Was working perfectly last time I used it, but now won't begin to fill with water. If I put it on spin, it tries to drain (even though there is no water in it)

The water level switch either has a stopped up hose or the contacts are welded together. Here are some manuals: https://dl.dropbox.com/u/8010163/Understanding%20automatic%20washer.pdf
https://dl.dropbox.com/u/8010163/Whirlpool-Kenmore%20washers.zip