Using the knowledge you gained through the courses.  Or just start typing.

OK I realize that answer was a bit flippant.  Sorry.
However, as short as it was it's accurate.  You will need to link to,  or import your current data.  Then, through one or more queries, you would need to clear out the "test" data, and then append your actual data.
Without some pretty strong understanding of queries, relationships, etc. that you develop in the courses it would be a pretty daunting task for a brand new user.
If this is the case and you are just looking for something to use you might consider paying one of the developers that have listed themselves for consulting here:  https://599cd.com/blog/display-article.asp?ID=1584

Harold, since the ABCD is still in the "building" phase, I haven't worried too much about this, but I realize that some of you may already be using what I've built in a production setting. One of the things I'm going to do in the next set of lessons is split the database. Since we're almost done with building the tables of the Core, it's about time to split. This way, when I release new features, all you have to do is update the front-end file.