Airport to your destination: I assume that the entry point is Frankfurt. Frankfurt is one of the busy airports and it could be that you are entering European Union at Frankfurt. If you are a first time traveller, this might be helpful Leave the plane Walk towards Baggage Claim. Once you get your baggage, there should be EXIT called "Ausgang" in German Immigration Check- Declare Gold /Diamond Jewellery if you are bringing any. Take them. Just ahead, you should see two police officers sitting there (Immigration Check), they will look at your passport, stamp it and let you go. Follow the signs towards train or bus station depending on your itenary. Train station : Head towards the train station. You should find it easily. It is in the same building as the airport, in the lowest floor. There are different types of trains in Germany, the most prominent ones are Intercity-Express (ICE), EuroCity ( EC), Regional Express (RE) & RegioBahn (RB), S Bahn ...
I have been living in Germany since 10 years and I would like to share useful information.