For general information about the recognition of qualifications in europe, check Your Europe: it offers information about which professions are regulated, the procedures to follow to obtain the recognition, as well as who are the National contact points.
You can also have a look at the User Guide "Everything you need to know about the recognition of professional qualifications" developed by the European Commission. It answers to 66 questions about the recognition of qualifications in Europe.
If you wish to relocate in Germany, the Portal "Recognition in Germany" gives more specific information, legal advices and concrete tools for the recognition of qualifications for the German labour market.