I just wanted to check that I get this right before going through the whole process. I have one blog in my root directory that I want to split into two versions for two cities (x and y). Before enabling multisites, do I move my current blog (for city x) into its own directory? Given that there will one day be a city z blog, I presume they should all be at an equal level. I know that the installs are virtual but I'm not sure what effect that has.
Once that's done, my host (1and1) doesn't support wildcard domains. I've created y.domain.com - is that enough to make it work or do I have to do anything else?