Fiverr, definitely. Many freelancers are able to make a living off of it - you just need to be able to find your niche and pitch your services to others. It's a very simple system that has the potential to make you lots of money.
You can sell your products on eCommerce platforms like Jumia, p2p platforms like Jiji, social media, or set up your website. Finally, start promoting your products online once you have everything ready. Attracting customers and building trust will be challenging when you just set up shop.
Well finding a legit website or platform is not so easy but I know of some that really pays sites like megawave prime share askcat and even Answeree pays you just need to put enough time