Hi, Amanda. Not yet a customer servant, so I can’t comment much about your new site except to say good luck and I hope it works.
As for your question about setting LJ to notify you when someone comments,, that’s one I can answer. Go to http://www.livejournal.com. Log in and then go back to the home page. Click user info. What you’re looking for is down at the bottom, or at least what is the bottom when read with JFW. It’s near the advanced options. It’s a checkbox: Get message board replies
Check this if you want to get e-mail updates when people reply to your journal entries using the message boards (comments).
Hope that helps. There’s a whole section devoted to handling comments and that’s the last option dealing with comments.