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In this first paper we simulate the population of disc Red Clump stars to beobserved by Gaia. We generate a set of test particles and we evolve it in a 3Dbarred Milky Way like galactic potential. We assign physical properties of theRed Clump trace population and a realistic 3D interstellar extinction model. Weadd Gaia observational constraints and an error model according to thepre-commissioning scientific performance assessments. We present and analysetwo mock catalogues, offered to the community, that are an excellent test bedfor testing tools being developed for the future scientific exploitation ofGaia data. The first catalogue contains stars up to Gaia G 20, while the secondis the subset containing Gaia radial velocity data with a maximum error ofsigmaVr=10 kms. Here we present first attempts to characterise the densitystructure of the Galactic bar in the Gaia space of observables. The Gaia largeerrors in parallax and the high interstellar extinction in the inner parts ofthe Galactic disc prevent us to model the bar overdensity. This result suggeststhe need to combine Gaia and IR data to undertake such studies. We find that IRphotometric distances for this Gaia sample allow us to recover the Galactic barorientation angle with an accuracy of approximately 5 degrees.

The analysis of realistic Stellar Gaia mock catalogues. I. Red Clump Stars as tracers of the central bar