New Project

I've got a new project.  Only a little one.  And only limited skill required.  I've decided to take some time off work this coming weekend so on my downtime on Friday I'm going to try and do some baking.  

Now obviously it won't be from scratch as that would just be silly so do I go for JUST ADD "Milk and Oil" or "Eggs, Milk, Oil & Icing/Filling"?  

Hint: I've just noticed while writing this that it says that the Icing/Filling needs to be added so don't have them (yet).  They're in the picture on the box so........  I have a lot to learn.