You will probably get many different recommendations, I'll share with you what I do, it's pretty simple. Take a small bucket or plastic container with an airtight lid on it and pour some sulfite solution into the bottom of it, maybe 1/2" deep. Set a strainer in the bottom, put it on top of something if it doesn't sit above the solution, you want to keep it high enough so that the corks don't actually touch the solution and get wet. Place your corks in the strainer and seal the lid onto the container. The fumes from the sulfite solution do all of the sanitizing work for you. I normally set this up with the proper number of corks in it when I'm starting a bottling session, so by the time the corks are needed, they've been in there plenty long enough. This setup is referred to by the folks here as a "Corkidor".