The answer to that question is really up to you, depending on your business model, and your timeline. I started off not having to spend much money, something I remember well because I had just been laid off from my job and didn’t have a lot of money to spend. With GreenExamAcadamy.com and SmartPassiveIncome.com, I didn’t spend more than $1,000 a month for the first two years of those businesses. It wasn’t until those businesses started growing significantly that I started to spend more money, and then I had the revenue to support additional costs.
When I started my first online business back in 2008 (GreenExamAcademy.com, formerly IntheLEED.com), the idea was to help aspiring architects pass the LEED certification exam. I hardly spent any money at all. All I did was start a blog, which at the time cost $6.95 per month for webhosting, and I used Bluehost. (As most of you know, I’m a big fan of Bluehost. And, because I have an affiliate relationship with them, you can get your business website going for much less than where I began, starting at only $2.75 per month!) [Full Disclosure: As an affiliate, I receive compensation if you purchase through this link.]
Get-rich-quick schemes and fad weight-loss diets are naturally popular because they satisfy the id while also attending to the super-ego. The ego's job is complete when it sees something like this. The appeal of "fast'' stems from the innate desire for instant gratification, so beware of what seems too good to be true (they often are) when you're looking to make money quickly. Be wary. Listen to the conversation deep within the confines of your mind and do your best to tame the proverbial beasts.
Amazon makes it fairly easy to list and sell old books on its marketplace. You can make more than just a few bucks If you have pricey text books from college. Be sure the books are in good condition. You'll get negative reviews if you attempt to sell books that are falling apart. Remember, add value where you can, no matter how small it might be and no matter how few people might readily notice it. 
As you likely know, Airbnb is a popular website where people can rent out a room or apartment from ordinary folks and bypass a hotel. So, if you’re comfortable with strangers and you live in fairly well visited place — a large city, college town, or tourist area, for example — you could make some money renting out a room in your home while you’re there, or renting out the entire place while you’re gone. You can expect to make less than whatever nearby hotels charge, but that can still top $100 a night pretty easily. In fact, Airbnb is the most lucrative of all the sharing economy gigs, according to one study.
Blogging is still a viable online business idea, and one with as much potential as ever. Just make sure that you start a blog on something that people actually want to read about. If that happens to be something you're passionate about that's great. But you need to understand that it's way easier to monetize a blog about organic dog food than it is to make money from a blog about obscure literary fiction.

Skillshare: Want to teach people things but don’t want to make them publically for free? Skillshare is a platform that allows people to create online courses to help others and if people use your course, Skillshare will pay you. Want to learn from other creators? There isn’t a better place on the internet. Skillshare comes built-in with an audience interested in learning online.

Through this experience, one thing I learned is that development, and the selling of the product you develop, takes time and money. This is a lesson I took to heart when I built another software company, SPI Labs, with my partner Matt Gartland. SPI Labs is behind the Smart Podcast Player, which was a significant undertaking that started out as a custom solution for AskPat and eventually became a successful WordPress plugin used by thousands of fellow podcasters.

Be a private cab driver. Companies such as Uber and Lyft have set up services that connect drivers with people who need a ride and are willing to pay for it.[27][28] In order to take advantage of this opportunity quickly, you must own a car, have a valid driver’s license, and meet other qualifications. It might take a little bit of time to get registered as a driver with the service, but once you are, there are opportunities to make money fast because these services are in high demand.
Med Trans, Inc. provides medical transcription services to doctors' offices and healthcare facilities across the US We recruit and train contractors to work from home either full-time or part-time as ... Work at home and at your own pace; You make your own schedule; Ability to work day or night depending on your preference; High demand in several industries for transcribers; Ability to spend more time with ...
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