During my pre-teen and early teenage years I went from playing with Transformers, GI-Joe and LEGO, to playing Nintendo, Sega and Gameboy. Eventually I added the card game Magic: The Gathering to the mix at about 16 years of age. All of these things were passions for me at various stages of growing up, but one thing remained consistent throughout each stage; I traded and sold toys and games I no longer wanted to make extra cash.
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.
Sell plasma. After passing an initial screening, you can usually sell your plasma for anywhere from $25 to $50 per donation. To qualify, you’ll have to stand in a long line or show up early, be willing to fill out a very personal questionnaire, and endure a painful needle prick or two. Still, selling plasma is a great way to raise money fast – if you can stand the hassle.
The final point is really important to me because I know that my interest tends to fluctuate. Every five years or so I feel like moving on to something new and leaving my main project. In the case of business, I want to ensure that there is a profitable exit strategy. The better you meet the previous criteria (profit margin, automated, scaleable and passive), the more money you can make when it is time to sell.
Medium is an online community where anyone can post articles and essays and get them in front of their audience of millions of monthly readers. While it can be a great place to build your audience for your own blog or find customers for your consulting business, with Medium’s new Partner Program, you can now make money online whenever someone reads your articles. Register for free and you can choose whether your articles are freely available or only readable by those people paying $5/month for a premium Medium membership. You’ll make money based on the amount of people who read and engage with your posts each month.
Find a profitable niche. Starting with your interests, write down as many niche ideas as you can. Think about topics people might search online. Ideas include passions (like surfing or body building), fears (like spiders or speaking in front of crowds) and problems (like getting out of debt). Do keyword research to see it others are interested in the topic. Find out if a domain name is available that matches the keyword 100 percent. 
A fitness site can have numerous revenue streams. Create healthy eating plans and recipes and lock them away as premium content. Promote and sell a fitness training course, eBook, or a series of videos. Or advertise your own personal fitness services on your site. Topfithub is a good example of a fitness site with decent video content alongside product reviews.
It was a very simple card shop made up of text listings of the cards I had for sale, the quantity available and the cost per card or per pack. I maintained the inventory myself from my room, sorting and listing cards online by hand using plain text. I didn’t use any software and most of the payments I received back then was via check or money order in the mail. Some kids would even send money and even coins (!) in the mail to pay for their purchase.
The ego is the driver making the decisions. It decides between the devil (the id) and the angel (the super-ego) on either shoulder (yes, all those cartoons you've ever seen are partly true). We have voices in our mind, and it's up to the ego to decide which one to fulfill. Its goal is to satisfy the id in some way while also attending to the super-ego.
There are different ways to market an ebook. One of the most common is through Amazon’s Kindle program. They can help you with all the steps to both publish and market your ebook through their incredibly popular platform. There are some specialized sets of writing software that will help with not only writing your ebook, but also formatting it correctly for the Amazon market as well Barnes & Noble and iTunes