I have some questions about how to change from Wordpress single install to Multisite. The website in question is: http://www.letstalknevada.com, which is currently a single wordpress install. We also own http://www.letstalknation.com, which needs to be set up as the 'master site', letstalknevada.com will be under that, and more sites in the future as we open up more states (ie. letstalkcalifornia.com).
1 - Can I change the current install for letstalknevada.com to multisite, then make letstalknation the 'master' site, or do I need to set up a multisite install for letstalknation.com then transfer the nevada site to that? (I need to be careful NOT to disrupt the nevada site much, it gets a lot of comments, etc.)
2 - Would you recommend subdomains or subdirectories for this application? The sites will all have custom URL's. (I'll need help getting that set up correctly too..)