If you buy a Haynes or Chilton manual for $16 ~ $20, you have wasted $16 ~ $20. They try and cover too many years, and don't do any of them well.
http://www.autobooksbishko.com/index.html is where you can buy Chryco LICENSED reprints of the genuine shop manuals, or you can buy the same manuals on CD (the CDs are the best way to go based on price).
You can hunt eBay for original print manuals, but finding your year and then bidding on them can get frustrating. Sometimes you will find original manuals on Craigslist in your local area, and they tend to be cheaper than eBay.
Don't waste your money on anything aftermarket, they aren't worth it, and please don't buy pirated materials.
That said, if you have a grease gun and a bright spotlight crawl under there and work your way from front to rear, left and right. Driveline slip joints, check the u-joints, check the axle u-joints on the front axle (may not be serviceable, don't panic if there aren't any fittings), and check around the front steering--again, not all joints are serviceable.
PS--although there are funny-looking fittings on the back of the rear wheel brake cylinders and on the front brake calipers, those are bleeder screws and don't get greased!
