Handy Man Services
Have a knack for fixing things? Why not learn a trade and make money off it. Depending on how good you are, and how well you package your service, you are almost guaranteed a regular stream of clients. Areas to consider; plumbing, painting, furniture fixing, tiling, carpet installation etc...

Set up an Agency
You might have to get creative with this one, look around you, see if you can identify a need and seek out a way in which you can act as a middle man between a client and that particular service. The options to explore are huge. For example, you can set up a recruitment agency to help companies find the right talent, or perhaps an estate agency to match property sellers to potential buyers, think far and wide, there are ideas all around you.

Childcare
Many working parents struggle to find affordable and reliable childcare for thier kids. Do you have a genuine love for kids? Are you trustworthy? Then there is an untapped market here for you. Create a website, offer a bespoke service tailored to suit your clients needs. You can even employ the help of professionals as your business grows. Please DO NOT venture into this business solely for monetary gains. Make sure you're a highly patient and tolerant individual who loves children.

Domestic Cleaning Services
More and more people are shying away from the use of housemaids. This creates a need for working families who have limited time for household chores. You can offer cleaning services to your clients on a weekly or bi-weekly basis. Make sure it is affordable and you have the right cleaning products for each type of surface. You can even create a website or Facebook page to add credibility to your business.

Event Entertainment
Got a talent for singing, or playing musical instruments? Why not start a live band for events? Believe it or not, there are people out there who still value live entertainment. Alternatively, you can DJ at events or if you've got wit and charisma, perhaps venture into comedy/MC duties.

Amazon Dropshipping
This one is more suitable for Nigerians abroad due to the lack of feasibility within Nigeria itself. Visit the Amazon website for more information.

Agriculture
Maybe not necessarily for the purpose of selling but simply for sustenance. Growing your own fruits and veg can add real value to your life and those around you. It's also fantastic for the environment.

Food Business
This list wouldn't be complete without food business and even though the area is already oversaturated, you can still make a lot of money if you are blessed with excellent culinary skills. Position yourself in a great location and your market will sell.