Ball Blue Book, the complete book of home preserving. I cannot recommend this resource highly enough. It explains the steps for water bath canning (used for foods like tomatoes, fruits, pickles, jam, jelly and salsa) and for pressure canning (used for low acid foods, like green beans or meals you might want to can, like soups and stews).
I am likely to buy a new canner this year -- it has been 12 years, after all. But well maintained a cannner can last for a long time. And replacement seals for pressure canners are available.
For either method, you need canning jars, lids and rings; tongs and a jar lifter. I will describe the process for canning in future posts. Whether you are new to home canning, or a seasoned pro, take time to read up on canning basics in the Ball Blue Book, or with resources from your Cooperative Extension office. Proper technique will yield excellent results and guarantee safe eating of your creations.