You'll need to process canned corn in a pressure canner in order to make it safely. Your pressure canner probably came with a booklet of recipes and timetables. You should get a replacement from the manufacturer if it's been lost.
To make cream-style corn for myself in small quantities, I cut the kernels from the cobs, scrape the cobs for more juice, add just a little water, then after a few minutes of simmering, add salt to taste, a bit of sugar, butter, and heavy cream.