The plant industry is beginning to provide cultural information with plants so you can tell what it needs. Generally, cool requirements suggest night temperatures of about 45oF and day temperatures around 60oF. Warm conditions are a minimum night temperature of 65oF and between 80oF and 85oF in the daytime. Moderate temperatures are probably easiest to maintain with 55oF at night and about 70oF in the day. Plants that require high humidity, an atmosphere saturated with moisture, need a greenhouse or terrarium environment to survive. Light requirements are fairly straight forward.
Full sunlight means just that, nothing breaking the rays of the sun.
Indirect light is available when sunlight which passes through a lightweight or lace curtain. Subdued light is available through a north window with no direct sunlight, or in the center of a room. No plant is able to survive without water. However some are able to go for several weeks between waterings with little adverse reaction. A few cultural practices like the use of plastic pots, application of mulches to the soil surface and the use of heavier soil mixes may help to slow drying and extend the watering cycles for some plants.