If you enjoy writing, find a topic you’re passionate about and start a website dedicated to covering that topic and anything else interesting you want to talk about. All you need is a computer, some time, and some energy to consistently write. It can start as a hobby and turn into a business over time. And blog hosting can cost less than $12 per month.
I also found especially helpful the section on earning "money with ads and affiliates online," and how to run a home business online. Once you have chosen your way to go, the book tells you how to get there with chapters such as "Managing your Money", "Protecting Personl Assets" and even "Working from Home." Especially important also would be the chapter on "Taxes and Deductions."
If you're operating your business as a sole proprietorship in the United States, you don't technically need an EIN for the business – you can file taxes for your business along with your personal taxes. However, you may want one if you want to open a bank account for your business, or if you don't want your Social Security number to appear on business documents.
As for other tips, all I can say is “a penny saved is a penny earned”. If you are running out of ideas to make money, start saving. Some quick “low hanging fruit” tips to save some quick cash include – switch to MetroPCS or Boost for cellphone (I only pay $20/month), switch auto insurance to Insurance Panda ($25/month), and start using GasBuddy (saves me like $100/month at least. I drive a lot).