Dividend stocks tend to be more mature companies that are past their high growth stage. Utilities, telecoms, and financial sectors tend to make up the majority of dividend paying companies. Tech, Internet, and biotech, on the other hand, tend not to pay any dividends because they are reinvesting most of their retained earnings back into their company for growth.
Yes, even once you have created your passive income machine, it still needs some attention. Just like a car, it needs to be maintained.  Granted you won’t need to spend 40+ hours a week on it, but spending a few hours a week or even a month will still be necessary to manage your business.  Continue to watch your cash flow, reinvest some of it in your business, and enjoy the rest!  Managing your business will help you keep the passive income machine running.
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Investing in real estate: Investing in real estate offers more passive income cash potential - but more risk - than investing in stocks or bonds. You'll need substantial amounts of cash to invest in buying a home -- it usually takes 20% down to land a good home mortgage loan. But history shows that home prices usually rise over time, so buying home a for $200,000 and selling it for $250,000 over a five-year time period, for example, is a reasonable expectation when investing in real estate.
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.