Not too sure from your description at which point are you stuck - 1, 2 3, 4 or 5?
By the way, have you read this article How to display and process forms in a Joomla article using DirectPHP?
If you set the id to the respective article id for article 1, 2 and 3, you should be able to move from 1 to 2 to 3 to 4 to 5 as you have desired.
Please give it a try one more time. Let me what you have tried and at which point you are stuck. If there's error, please let me know what are the error messages that you see on the screen.