Key questions that you could to ask yourself to achieve this goal are below:

1.    Why do I want to write a book?

2.    Where can I collect content?

3.    Do I write a blog?

4.    Have I written content for publications?

5.    Do I have content in writing that can be scanned, converted to Word and used as part of my book?

6.    What is my conclusion?

7.    What is the goal of my book?

8.    Who is my audience?

9.    What solution does my content offer the reader or user?

10.    What is my blurb?

11.    What are the notes do I need to make?

12.    What is my introduction?

With these 12 questions, assign five minutes to answer each one.

This can provide you with a litmus test, to determine if you have sufficient content to write your book.

These were the questions I had asked myself before I commenced any of my publications.
Some of my content I have been building over some years. However, the collation and ordering took a very short time once I answered these questions.

How do your answers look?

Are you closer to writing your book?

If you did not have sufficient content, use the time over December and January to build it.

What steps can you take to do this?

Perhaps you could try one of the following:

1. Set yourself one hour per day to work on your content.
2. Carry a notebook and pen for inspired thoughts.
3. Dictate your thoughts into a voice recorder or app on your phone.
4. Draw some pictures.
5. Create some Visual Notes.

The aim is to keep at it.