When can I start making games?

Hi everyone, hopefully I’m posting this in the right section. Anyway my question is when can I actually start making games? I’ve been learning Java at a pretty slow pace over the past few months and I’m only on chapter 4 out of 16 in the book I have bought. Anyway my question is will this book give me the proper/enough knowledge to the point where I can move on from it and start learning how to use things such as LibGDX? My Spring break also starts soon (which is 10 days), would it be possible for me to finish this book during that time if I do 4+ hours every day?

Here is the book I purchased (You can view the chapters and what they’re about by clicking on “look inside”: http://www.amazon.com/Java-Beginners-Guide-5th-Edition/dp/0071606327