Planning Move from the US to Spain for an extended stay (1 year)

Looking for expats tips and guidance for relocating from the United States to Spain.  What were the major steps you took, lessons learned, and recommendations for making this move as easy as possible. 

My wife Le and I are looking to move to Spain from Tampa Florida in January 2018.  We are both retired and would like to live in a coastal city within a 45 minute train ride of Barcelona.  Also would welcome thoughts about potential cities / towns that might be good places to relocate either from expats or locals.  Our plan would be to rent a 2 bedroom house or flat for 1 year, a balcony overlooking the Sea would be ideal. 

We of course have our US Passports but are interested in understanding additional steps we need to take to make this move happen.   

Thanks for your help.

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