Try going to our post: 20 Sites That Will Pay You to Read Books: Even though editing is not what this post is about, there are several companies that might do book editing such as Kirkus: I hope this helps and good luck on your book!
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4. Affiliate marketing: Getting paid to tell people what you like and showing them where to get it. As a Dad, I tried 3 high chairs before finding the “Bumbo.” Now if I blog about the Bumbo and link to it to my Amazon account, and someone buys it, I can earn a commission. This is also a great way to build money over time, but it requires new content, staying top of mind and driving lots of traffic.
I have only dabbled in drop-shipping before when I had an eCommerce platform 6 years ago or so. I think it is something that you could do on the side, but you would want to do in depth research on the industry you want to get into before setting up shop. It may be a little less passive up front, but over time you could take your hands off the wheel.

If you're looking to get started in real estate, look at a crowd funding solution like RealtyMogul. It works similar to LendingClub - you commit as little as $5,000 towards a property. When the property is fully funded, you become an owner, and will receive your share of the earnings and appreciation in the property.  Check out RealtyMogul to learn more.