I signed up for my 1st - 5k. What do I do next?

In my evolution from running on a treadmill to a 5k event, I had to come up with a plan to get me to the finish line.  Since none of my friends run, they were of no help.  I dropped by a local brick and mortar bookstore, but their shelves were of full of books for those wanting to do mostly marathons.  A few books were on half marathons.  I guess it's hard to write a book for a 5k, since the event is so short.  I mean how much can you write for a 5k.

Off across the Internet I searched.  The plan I liked the most was the Couch to 5k Training Plan.

Best all, it was free.