Do not start your indoor seedlings in soil.
Does that surprise you? Yet, even good garden loam is not the best choice for growing transplants.
For one thing, soil is more than just dirt. It is full of micro-organisms such as nematodes, bacteria, and fungi. Out in the garden, they keep one another in check. Indoors, it’s another story. One of the most common causes of seedling failure, “damping off” is a disease causes by a fungus. Once infected, it is fatal to the baby plants. The only hope is prevention.
You do have the option of sterilizing your garden soil. You can bake it at about 250º F for several hours. That will kill all those nasty diseases. It will also create a stench in your home. If you want to stay on good terms with your housemates, this is not the best way to go.