You can start worm composting by simply tossing table scraps and other organic matter on the ground, keeping the material moist, and perhaps covering it with a board or some kind of sheeting material. I think worm composting works best in some kind of container which can be as simple as a sturdy plastic box with a lid and a few drainage holes. Here in S.C. temperatures get up to 100 degrees and my worm box which is located in the shade, seems to provide a decent environment for the worms. IMO is is good to have some loose organic matter like leaves or straw to help inuslate the bed and protect from extreme temperature changes. Also the dry material helps absorb excess moisture. It is best to have the worm box or worm bed in a shady location here in the south, though sunny days are good for the worms during the cold months. I don't see any reason why a person couldn't start up a worm composting bin for a cost as little as $5 for the box. Everything else should be free, if you get a few local worms from the ground. Even the container can be free if you find a used container that would serve as the worm composting box.
Eclectic gardening style, drawing from 45 years of interest and experience. Mostly plant in raised beds and containers primarily using intensive gardening techniques.