The central air unit out side is turning on but no air in the house it isn't going through vents and I don't really know how to work the thermastat in is set on cool but nothing can you help

Is the blower in the furnace not working?, if not in air mode,does it work in heat mode,, or set to fan only mode,, should be set on cooling and auto fan mode

Some say those thermostat are hard to work that's the reason I turn my A/C on with a light switch. I'm thinking about the clap on, clap off.