Ebooks are one of my favorite sources of passive income. Now, you can do this the simple way and just publish it on Amazon's KDP. Or, you can go all out and build yourself a book funnel. Book funnels are powerful, but they won't be fully passive. For example, if you do a free-plus-shipping offer for your ebook (converting it into a physical book), you'll need to create some one-time offers (i.e. extra training) and up-sells (i.e. an audiobook). But, a book funnel can be very powerful.
Agreed but I might consider a blended portfolio of large and small cap stocks using low cost mutual funds (I found a fidelity large cap fund FUSVX with a net expense of .035% that has also delivered 17%+ YTD gains, some are dividend some are growth stock in the fund) UNLESS you’re close to retirement. This way you get the growth upside on small cap paired with the stablilty of some large cap stocks while maintaining balanced ricks. 

I’m a 45 year old business owner who also has focussed on diversifying my income streams. I have a short term vacation rental in Florida that I bought for $390k in 2012 and net rental income for the last three years has been growing steadily. 2015 I am at $70k gross right now but should end up at $80-85k with net around $45k plus we use the place about 35 nights a year.
Tenants usually move out before the court date but you may have to pay for a removal by the sheriff. All these fees and time delays add up and you can see why it is important to check tenant applicants in the first place. Having a formal eviction procedure will help avoid procrastinating the process and missing out on several months’ worth of rent trying to get tenants evicted.
* I use Personal Capital to track all my finances in one place. It’s much easier to use their free software to follow 28 accounts on one platform than to log into various accounts to check my balances. They’ve also got great tools for x-raying your portfolio for excessive fees, recommending a more optimized asset allocation, and planning for retirement with their Retirement Planner.