Does it freeze where you are? If it's just rain, the easiest worm bin is a storage tote with a lid to keep the rain out. Lots of small holes around the upper edges for air circulation and some way to have drainage. A screened false floor with either a hole below it or I have a hose spigot to drain the leachate.
Properly run, they don't smell at all and you could even keep a small bin under the kitchen sink for convenience. They like the dark and don't like sunshine for either the light or the heat, so if outside keep them in the shade if you can or set up a small umbrella or hang some cloth above the bin to keep it out of direct sun.
If it does freeze solid in your climate, the worms will freeze and die, but there should be plenty of cocoons to repopulate once temps increase. Each cocoon will hatch between 3-7 worms and each worm can lay a new cocoon every few days or something and each hatchling reaches sexual maturity in something like 2-3 months if memory serves so, once the bin is up and running, the exponential growth of the population is incredible. Their population is self regulating though so you won't be overrun, and that has to do with the environment (moisture level in the bin, amount of food given, pH of the bedding, etc).
A pretty easy project, especially considering the benefits.