I sell jewellery and I now make enough to live off.
It was initially something I collected and raised cash by selling of my extra bits. I sold everything not bolted down at one stage.
It's taken a few years to get properly established and initially attempts at a few different things. I now also sell on Amazon and tentatively my own website (currently on holiday).
I work fairly long hours but have three DC one who is severely disabled and one with moderate additional needs. I never have 5 work days without apointments, school visits or a child at home so working for myself was my only real option.
Just as my jewellery was taking off, I started selling for family/ close friends for 50% of the achieved sale price. Surprisingly popular as people have so much stuff they need to shift but haven't got around to selling. It's also a good way to learn the platform and selling at greater volumes than the odd item. It's not long before you need to think about courier/ post collection, where you'll store things at home, volume packaging purchase, home desk/ office space.
I use a corner of the lounge but also have floor to ceiling Ikea expedit cube storage for packaging and over stock. I now have warehousing for my dispatch.
I started by walking to the post office on the school run, then had to drive as more packages, then had a post collection (saved a lot of time each day). Using warehousing now means I'm not tied to a post collection time at home and can keep the business open when away.
The market is ever changing with new people coming in and undercutting etc Newbies don't have to VAT register so have a price advantage. Being self employed is ever changing too with VAT registration, now digital tax registration, Brexit, German VAT registration, deciding format of business should I now be setting up a limited company.
It's not to difficult to earn a few thousand a year, turning it into a proper business involves a lot of organisation and establishing personal boundaries for hours of work, area of home that will become over run etc.