People are always looking to have their cars washed and detailed. You could be a mobile car washer and detailer without having a permanent location. Reach out to people you know or make some flyers and put it in your neighbors' mailboxes. If you want to get serious about it, prop up a one-page website or give out business cards. You can make money quickly doing this.
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.
Uploading videos on YouTube - You can monetize your funny videos on YouTube with Google AdSense. All you need is a YouTube channel then upload videos of your funny cat or your crazy friend, and YouTube viewers will get you paid. Getting paid to download apps. You can get paid by specific companies by downloading their apps and getting bonuses for every week the app remains installed.
If you have a propensity for writing and you can slay with your prose, consider writing an ebook. While the market has certainly become saturated as of late, books that help teach people about a technical topic still sell extremely well. This is a great source of passive income but does require a large amount of effort at the outset before any money is generated.
Mechanical Turk: Amazon's Mechanical Turk is a resource for doing human-intelligence tasks, or as the site commonly refers to them, HITs. You get paid a very small fee for any given HIT and you'll need a good deal of volume to make a substantial amount of money. But it is a resource you can use in your spare time to generate a small income online.
A thing that needs to be ironed out for your online business is your billing service. While there are businesses that may bill their clients directly after a contract has been agreed upon and signed and these bills are paid for through checks that are deposited into the service provider's bank account, there are some clients who require a certain online billing system for them to pay for the services they have contracted. You may need to register with a billing system like PayPal for your online business to make billing and payment easier and less of a hassle to you and your clients.
Double check yourself, before you double wreck yourself. Make sure everything you send to a company, whether a résumé, an email or a portfolio, is good to go. Double check your grammar and wording, and for God’s sake use spell check! This is especially important when it comes to the company’s name. Don’t spell their name wrong and be sure to type it how they type it (e.g. Problogger, not Pro Blogger).