Implementing an Online Shop can be a risky project, since there's no widespread and profound knowledge and experiences. This guideline is intended to support managing the organizational, technical and human challenges in Online Shop implementation projects. An overview of the implementation process is given. Subsequently the development of a concept, using the services offered by a company to its customers, is discussed. Prototyping, Realization and Operation of the Online Shop are further topics. The last part introduces some practical 'Helper' tools for the implementation of Online Shops.