First physics results from the CMS experiment at the LHC

Establishing all major SM processes and beginning the searches for new physics was the major goal of the first run of the CERN Large Hadron Collider. The paper describes the first results obtained by the CMS experiment in studying pp collisions at root s = 7TeV. We present first the measurements performed on W, Z and top quark. We then describe the searches for new physics performed by probing any eventual internal structure of quarks, and by looking for new massive gauge bosons, microscopic black holes and particles hinting at large extra dimensions. The first results on the searches for SUSY and Higgs particles at LHC are lastly discussed together with the prospects for the current 2011-12 running period.