Buy indoor worm composting bin
I composted outide for years. It works great. I made the change awhile ago, however, and purchased indoor worm composting bins and the composting is doing much better. Why? I can now compost year round with my worms working all winter. I keep the indoor composting bins in my basement...the constant temp allows the worms to never slow down. This means I get to harvest worm castings constantly, not yearly, like I did prior to the purchase of the bins.
Where can I get worm composting bins?
You can build the composting bins, if you're handy. Be sure to understand which materials decompose during the composting process. Don't use materials that will leach into the compost and harm the worms.
I bought a composter online. I've very happy with it. It came in about 2 weeks (my worms arrived in about 5 days...so be ready with a home of some type for the worms...or order them AFTER you have the worm bins!
Home and garden centers likely sell worm composting bins, as well.
What to look for in a composting bin?
The material should be suitable for worms. Avoid cedar (which harms worms). If the units are stackable, ensure the worms have holes in the bins to move up.
Make sure the bins are durable. My bins stack 5 high, if they weren't so tough, the weight on top when I lift them off to harvest the worm castings might damage the ones below. Not a problem for my setup, just suggesting you consider it.
Another nice feature when purchasing a worm composting bin is a tea compost spout. This is a spout at the bottom of a bin that allows the compost tea to drain out (into a container, of course). Collect this to fertilize plants.
A final consideration is how contained the unit is. The composting bin needs to be 'breathable' so the worms survive, but you don't want compost tea draining out or worms escaping or too much smell escaping. My unit seems to be a great balance of this.