I started with Lightroom CC yesterday, and acted with it as if it was iPhoto. Now I understand, and I'd like to wipe the slate clean and just start over. How to do that?
File -> New Catalog
As stated above. Just start a New catalog, name it whatever you like, import your images.
In the LR preferences make sure that new catalog name is selected for the Default catalog "When starting up use this catalog" or have it set to "Load most recent catalog".
Doing fine now.