I’ve looked into this myself when I have had time and still researching when I have time but thought I would share what I’ve learned so far. The requirements for selling food/baked goods vary from state to state, where I live most edible items that are being sold need to be first baked/cooked in a professional kitchen. The key is to search requirements for selling baked goods in (your state).
More and more people are looking for someone to care for their pets when they can't - people who don't like the idea of putting "precious" into a kennel. Professional pet care givers come into the home to care for the pet while the owner is away, feeding, walking, and playing with the animal(s). If you love animals and are knowledgeable about them, this could be a great business for you. According to the National Association of Professional Pet Sitters (NAPPS), in-home pet-care is one of the fastest growing industries in North America today.
People are turning to audio and visuals when it comes to technical subjects. However, you should consider doing an ebook first and turning it into an audiobook through a resource like Audible's ACX platform. You can hire a producer either through a royalty share program, so you don't have to shell out upfront cash, or you can do a pay-per-hour hire as well.
Blogging can potentially be a profitable home-based business, but you need to pick a niche that’s not already saturated with competitors. After you’ve figured out how to generate enough Web traffic to your blog — either through SEO, content marketing, or other means — the next hurdle is to find just the right products, services, and/or ads that your readership will respond to. In my experience, it’s often a matter of trial and error before you find the winning combination of strategies.
Tasks like naming the business and creating a logo are obvious, but what about the less-heralded, equally important steps? Whether it's determining your business structure or crafting a detailed marketing strategy, the workload can quickly pile up. Rather than spinning your wheels and guessing at where to start, follow this 10-step checklist to transform your business from a lightbulb above your head to a real entity.
My next self-funded business hit $160,000 in revenue in its first year alone. After that first taste of self-made success, I’ve gone on to sign consulting contracts worth tens of thousands of dollars with startups like LinkedIn and Google, launch profitable online courses, and build a following of hundreds of thousands for this blog and my podcast series.
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. 
In 2017, there were almost 90 million pet dogs in the US. Which has opened up a huge opportunity to make money online as a dog watcher or sitter. Specialized sites like Rover or Care.com connect pet owners with pet walkers, sitters, and boarding houses to help look after their best friends when they’re at work or on a trip. If you’re an animal lover, you can make extra money and get to spend some quality time with a furry friend.
If you’ve got experience and expertise in a specific area of business, there are hundreds if not thousands of business owners who would love to jump on a phone call and pick your brain. This can be an easy way to make extra money online and to hone your skills to use in your consulting or freelance business. Sites like Clarity.fm let you create a profile where entrepreneurs and business owners can pre-pay to book a phone call with you for a set amount of time. Whether you’re an expert in raising money for startups, building apps, or running a restaurant, you can make extra money selling a few minutes of your time to people in need.
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).
Photos of people can only be sold for commercial use if they've signed a 'model release' that gives you permission to use their image (children need a parent/guardian to sign). Without a release, these photos can still be sold for editorial use, as long as they were taken in a public place – eg, if you submitted a 'breaking news' shot with people in the background. If there's any doubt, always ask permission.
Many gymnasiums will trade membership and often a bit more for a person willing and able to teach an exercise class. You can also find people who don’t want to go to a gym and train them at home as a personal trainer. If you’re in good shape, this is a great opportunity to earn some extra money, plus it can often lead to additional income with one-on-one instruction opportunities.
Tutor students. Many families prefer the flexibility of using an online tutor. Depending on your background, you could be simply helping a child with homework or providing college-level support. You need to have your own computer and high speed internet. Experience required differs among companies. Some require “strong experience,” while others require a specific educational background. However, most companies do require a college degree.
As someone who's been immersed in a number of online industries for quite some time, I know a thing or two about what it takes to succeed in this arena. However, just like you, I started at ground zero with little knowledge, but a great deal of passion. What I learned along the way were some invaluable lessons from failure that hurt at the time, but helped immensely in the grand scheme of things.