While your working on your site, you may find this info useful:
www.rockettheme.com/forum/index.php?f=15&t=61751&rb_v=viewtopic
www.rockettheme.com/forum/index.php?f=15&t=61748&rb_v=viewtopic
So, here's the question, what, in general is the best way to migrate from the sample content to my own.
Looks like one way to eliminate the different pages is to un-publish all the main menu items except home. I would put my content on home page and then add more menu items.
I guess I would eventually delete all the extra content...?
Yes, that's one way to do it.
Unpublish what you don't need and then starting your won Sections, Categories, Articles, Menus, Modules, etc.
Another way to do it it to leave the install with the sample data intact to be used as a reference.
Then install another copy of the template with the Rocket Launcher without sample data.
Build your site on the 'clean copy', and as I mentioned, use the install with the sample data to look at the back end or copy code from.