Reddit reviews Using Microsoft InfoPath 2010 with Microsoft SharePoint 2010 Step by Step

No programming necessary, it's all out of box functionality.

Here's a tutorial that covers the unique ID and form saving I was talking about. It's written for InfoPath 2010, but things aren't so different in 2013:
http://wonderlaura.com/2012/01/01/infopath-save-draft-form-functionality-a-better-way/

When you build your form, you'll then want to add another button called "Copy" or something with the following rules:

• Action rule to set the unique id field so it's no longer the same. If you're using now just copy the same rule to this button, and it'll change because Now() has changed. Or just have it add a one or something to the previous file name.
  
• If desired, add more action rules for each field you want to not carry ovier to set them to be "" (blank).
  
  Laura Rodgers has some great beginning InfoPath tutorials on her page and she co-wrote a book I found invaluable when I was starting out with SP & InfoPath and had no clue: Using Microsoft InfoPath 2010 with Microsoft SharePoint 2010 Step by Step . At the time, that was the only book I could really find that had focus on InfoPath specifically, and it's actually really well done.
  
  Also, check out the SharePoint at RackSpace channel, lots of good beginner tutorials there too.