The first step to start working with MoBi® is to create a new project. To do this, click on the New Project command in the File menu. You can either work with amount or concentration based reaction networks which needs to be specified when creating a new project. Empty building blocks are automatically created shortly after in the Building Block Explorer: Molecules, Reactions, Spatial Structures, Passive Transports, Observers, and Events. Some of these building blocks need to be filled with data, which is successively done in the next sections.