Rather than entering dummy data into my developer account, I read in another post, that you can use sample data that is already built into Dev accounts, but I don't know how to turn it on. Any help would be appreciated. Thanks.
The sample data is already there when you first activate the DE Org. There should be a selection of Accounts, Contacts, Cases, Leads, Opportunities and a few others. If you go to any of those tabs you can see what is there with different views. Also if you look under Setup > Data Management > Storage Usage you can see the number of record already present in different objects.