ChrisMC2005,
You're 'interest' in the book is something to take note of. Interest or desire is a driving force to learning.
Your 'thinking about it' is anther indication that you are helping to anchor the information for later use. Thinking about it as you say is a great way to turn facts into knowledge.
Knowledge is something you can turn around with and improve many aspects of your life!
You're on the right path!