Start with a room diary and a buyer conversation. Record where the room is, when you plan to grow, how hot and cool it becomes, and what equipment you can reliably operate. A weather app describes outdoor conditions; a roof, packed growing material and poor air movement can create a different environment around the crop. Measure in the proposed growing area before committing to a species or a season.
Next, identify the exact mushroom and strain available from a traceable spawn supplier. Button, oyster, milky, paddy straw and shiitake use different growing methods. Even the name oyster covers several species with different requirements. Ask the supplier for the intended substrate, incubation and fruiting guidance, storage instructions and batch identity. Match those requirements to the conditions you can actually maintain.