In the Flux sandbox, users can create an InfluxDB database and seed it with data using line protocol or the InfluxDB API. The Flux query language is enabled by default in the sandbox, allowing users to start querying their database immediately. Users can use Chronograf's Explore tab to visualize their data and write Flux queries to retrieve specific points from their database. To implement Flux queries in a Rails app, users make a raw HTTP request to InfluxDB's query endpoint using the `net/http` gem, sending their Flux query as part of the request body. The response is then parsed into a usable format using PORO objects and methods.