17. Amazon – Have you heard of FBA? It stands for “Fulfilled by Amazon” and it’s getting pretty popular. Basically, you buy products (in bulk is best) and ship them to Amazon for them to store. When your products sell, Amazon packs them up, ships them out and sends you the money (after taking their cut). There are people making a full-time living from FBA, while others just do it for some extra money.
If your goal is to make enough money to retire early, prioritize earning potential over job satisfaction, since you plan on getting out of the rat race early, anyway. Consider the types of jobs that pay extraordinarily well in exchange for hard work, little psychological satisfaction, and a punishing lifestyle, such as investment banking, sales, and engineering. If you can keep your expenses low and do this for about 10 years, you can save a nest egg for a modest but youthful retirement, or to supplement your income while you do something you really love doing but doesn't pay much. But keep in mind that delayed gratification requires clear goal-setting and strong willpower.
It depends on where you live. Many public places will require you to have a permit for sales. However, in a nice, family-friendly neighborhood as a kid, it would likely be fine. If you plan on selling street-crafts for a living, find out what the local regulations are and look into the costs of a stall, half shipping container or other form of suitable "pop-up shop" because you will be out there in all sorts of weather and you'll need to protect the crafts.
I surprisingly get a lot of people asking to detail their car. I never intend to make a business of it, but I love doing it to my cars and people ask me to do it to theirs. All it takes is a cheap orbital buffer (mines a used craftsman) and a shop vac. I normally get easily $100 for a basic wash/wax/vac, or $200 to remove scratches and polish then wax the car.
Ebooks can be a hard path to online success too, from my personal experience but as you rightly said, it can be a great gateway vehicle to drive traffic to other monetized sites. Having said that though, getting your ebook on Amazon, Barnes & Noble, Lulu, Smaswords etc., is a great way to get noticed and make money overtime. An arresting e-book cover is a MUST! And if you are a DIY freak like me, you could do your own e-book cover for $0. I also use a graphic design software similar to Philip’s.
What, specifically, can you sell on Fiverr? Anything from graphics and design services, to digital marketing, writing and translation services, video and animation services, music and audio, programming and application development, business services and lifestyle services that includes anything from celebrity impressions, to gaming and even astrology readings. 
Most of us are guilty of hanging onto things that we never use, myself included. Take a day and go through all your old stuff and get rid of some of it! One tool that is really helpful for this is Decluttr. You can enter your items barcodes into their valuation engine and they’ll give you an instant offer. Then you simply pack all your items into a box and ship them off for free.
Inherit money. If you have a wealthy, elderly relative, you may receive money when the time comes to read his or her will. Of course, if your relative regards you fondly, s/he is more likely to write you into the will, so try to stay on your elderly relatives' good sides. Hopefully, this goes without saying, as treating the elderly with love and respect solely in an attempt to get their money is obviously incredibly cruel and cynical.

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