This research belongs to the field of theoretical flavour physics, which is a branch of particle physics. It is carried out as a 2-year fellowship in the Theory group of European Organization for Nuclear Research (CERN) in Geneva, Switzerland.The standard model of particles physics (SM) describes three fundamental interactions acting between the fundamental constituents of matter, the quarks and leptons. The matter particles, distinguished by their `flavour' quantum number are grouped into three different generations. Flavour physics studies the transitions between these three generations. In the current LHC era the focus of particle physics is the discovery of new laws of physics beyond the SM. Since flavour changes are highly suppressed in the SM, flavour physics is an excellent tool to probe this new physics. Recently observed anomalies in B physics (Bs mixing, Bs->mumu and B->tau nu) and in the anomalous magnetic moment of the muon challenge the SM and call for an explanation in models of new physics. Together with the high energy results from the LHC, these decays can help to clarify which model of new physics could lie beyond the SM.SUSYFLAVOUR focuses on flavour-changing effects in the minimal supersymmetric standard model (MSSM) which is the best motivated extension of the SM. The MSSM possesses many new sources of flavour and CP violation stemming from the supersymmetry-breaking sector. A lot of theoretical effort is devoted to the understanding of the mechanism governing the flavour structure of these supersymmetry-breaking terms. The research pursues several avenues to map out this structure. All lines of research will be phenomenology-driven, using the upcoming data from the CERN experiment LHCb, Atlas and CMS.