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Arriving in Frankfurt and have some time before traveling to Cologne, Germany

I would like to see old town Frankfurt (Roemberberg?) . We are arriving at 10 am into the Frankfurt airport. What transportation should I take to get to old town? When we want to leave for Cologne - do we go to Frankfurt am Main station from Roemberberg to take a train to Cologne? Can we store our luggage anywhere while we sight-see Frankfurt? Thanks. I am researching but a little confused.