Star formation is one of the most exciting fields in astrophysics, especially the formation of high-mass stars, which remains a puzzling subject. It is still not understood whether the most massive stars form via similar disk-accretion processes like their low-mass counterparts, or whether different physical processes like competitive accretion or the coalescence of protostars come into play. Our work is dedicated to the investigation of the earliest stages of massive star formation with special application to the studies of potential massive disks, the initial fragmentation processes of high-mass star-forming regions, core chemistry, magnetic field properties and outflow/infall studies. High-mass star formation proceeds in a clustered mode at typically large distances, and thus high angular resolution is essential to spatially resolve the regions. Furthermore, young massive star-forming regions are strong line and continuum emitters at (sub)mm wavelengths. Therefore, we focus on interferometric studies at (sub)mm wavelengths. This observational approach is accompanied by theoretical modeling of massive disks and their associated cores. Moreover, the far-infrared satellite Herschel launched in 2009, and the Atacama Large Millimeter Array (ALMA) is expected to be in early science operation in 2011. We are and will be at the forefront in using these exciting next-generation instruments.