Call the Extension Agent of your county and ask for canning and preserving books. I have had excellent results with their publications.
I always used a water bath, and canned tomatoes, pickles, peaches, jams, jellies. I know a pressure cooker is good for meats, green beans. I never did invest in a pressure cooker, but my Mom had one, and it scared me to death when it went to whistling, ect!!
good luck. You will enjoy.
Mariah