Buying and selling on eBay, Facebook market, 2econdhand, Vinted, etc You can start at your rhythm. You can specialize in a niche or multiple niche or you can be a generalist and find what you like more. If you have a lot of space to fill you can start to buy car parts and even broken-down trucks/cars for parts. Kitchen appliances and parts. Or you can store furnitures. The key is in the ads you will make. A lot of photos. Taking care of the staging of your photos. Long descriptions. People love to read about what they are interested in. Being on time, making clear appointments, responding quickly, proposing shipping, etc etc. It's possible to make some money like that but not to get rich.