There are numerous printing companies that will print your designs onto not just T-shirts, but also hoodies, hats, posters, cushions, bags, and phone cases, to name a few items. These businesses also offer fulfillment services. This means that you promote the merchandise on your own site and once you sell a product the printing company will not only print your design but also send the item directly to the buyer. So all you have to do is concentrate on the marketing and selling of your products, and the fulfillment company will take care of the rest.
If you have the gift of gab, public speaking is a worthwhile side business idea for you to pursue. Many authors, medical practitioners, scientists, artisans, politicians, and other subject matter experts earn extra income by delivering speeches, seminars, and presentations. Professional motivational speakers earn an average annual salary of around $90,000 with just that portion of their income, making this a very realistic side business idea while you continue practicing your craft.
This can either be done locally or through an online service like Fiverr. Resumes are something that people can be very insecure and self-conscious about, which means there is always a demand for services that will help spruce them up. Holly Hanna from The Work at Home Woman wrote a really useful article on How to Make Money from Home with Resume Writing.
Join a startup accelerator: Another great option is to apply to a startup accelerator like Y Combinator, 500 startups, or TechStars, where a group of investors will help coach you, connect you with potential partners, and provide startup cash in return for a small stake in your company. The competition is tough to get into these, so don’t rely on them as your only path forward.
There are many freelance options for graphic designers who are looking to make money online. Designing layouts and graphics for promotional material, corporate reports, magazines or book covers, are all tasks that businesses are looking for online freelancers to complete. Due to its flexible nature, graphic design possibilities can range from one-off projects to ongoing work with regular clients.
Once you have this down, you’ll be a budding Etsy entrepreneur. Provide great quality to your customers, and they’ll often return. Many people are willing to pay a premium for quality handmade designs. Etsy (like EBay and Amazon) takes a cut off the top for selling items through their site. PayPal takes another cut, and you have to be careful with taxes on all income, so be diligent while building your online business.
I may as well start with something I know well. When I started out as a freelance writer 20 years ago, things were very different. I wrote mostly for magazines, and I had to rely on snail mail to send out drafts and queries. I’d wait weeks for a response from my editors. Not many people had the patience for it, and few stuck around long enough to ever start earning a real income from it.
When I set out to start in on a new business idea, I always make sure it aligns with both my core competencies and my interests. It starts with learning how to discover your strengths as an entrepreneur, and it's how I make sure I'll be engaged, even when the going gets rough. I learned this the hard way when I decided to start a freelance business a few years ago to offer my freelance content marketing services.
A reliable high-speed Internet connect is a requirement, of course, to access the databases from which you’ll work. Often working as part of a team, data entry professionals may be asked to log into a company’s database system to make entries or access data for other purposes. Depending on the employer and industry, a high school degree, and perhaps an additional certification, may be the minimum education requirements. And of course you’ll need to be fast and highly accurate at inputing data.
But if you get the green light to do it, starting a catering service is a relatively low-overhead way to create a new business. It’s a lot of work, but if you enjoy cooking, it could turn into a lucrative and fulfilling career. To get started with minimal investment, you could first cook in your customers’ homes and use their dishes. Also, a narrow specialization on a particular type of cuisine or event may help you attract clientele as you work develop a strong customer base.
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. 
This has become a popular business model for online entrepreneurs over the past several years, and will probably just continue to grow in popularity. The best thing about selling online courses is that once you do the up-front work in creating the course and setting up your marketing strategy, you can get paid over and over again for work you do once.