Seeds can be bought at hardware and home and supply stores and there is a big variety. Choose seeds that are suitable for your area and climate. Depending on the size of your garden you will probably plant one row of each vegetable. These stores also sell plants that are ready for planting. Some people prefer the plants because they seem to grow faster and there is already a good root system on them.
Some people prefer the plants because they require less time to mature.
There are those who have no patience when it comes to waiting for seeds to come up. A fall garden is always nice. At this time of the year its cooler and much more pleasant to work in the garden. Choose plants that grow well in cool weather such as any kind of greens, winter squash, lettuce, and celery. I've always had good luck with my fall gardens, especially with mustard greens and collard greens.