It depends on what type of business you want to run. If it involves food, then you will need an approval from NEA to bake/cook from your kitchen. There's hygiene level concerned so you need a license and it's probably a bit more troublesome.
there are also mums selling baby clothes, adult clothes, toys, etc, those which you will probably need some capital.
It also depends on how big a scale you r intending to do. If you run your business from home and people keep coming to your house, creating noise and inconvenience to your neighbors, they may lodge a complain against you.
Would be good if you can share some details on the nature of your business!