Anyone from FRANKFURT:- Reach Frankfurt Railaway station from Airport?

Hi, I would like to have some details
1. How do i reach Frankfurt RAilay station from the airport ( walkable , taxi .. avg fare.. etc
2. I need to take a train from Frankfurt to Nurnberg ( avg cost , luggage allowed .. )

3..Few words of caution to a newcommner at germany ...

Thanks for u r time,
Regards
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