That depends on your current situation. In any case you need to move your center of life abroad and may no longer have unrestricted access to a home in your home country (in Germany this is called "Schlüsselgewalt").
This means you'll inevitably deal with topics like minimalism, taxes, schooling, deregistration, residency, etc.
If you want to learn more, we recommend our e-book "Der ultimative Auswanderer Guide" (in German). It shows you step by step how to move abroad from Germany as a family (or as an individual).