I just bought my tickets to Barcelona and booked a plane.
Now I would love to get a map of Barcelona and some answers on my questions. Is there anyone that can help me??

I like to know what is the most easy and cheapest way to get to the stadium form the aiport?
Is there something like an underground?
Is the stadium far from the city center?
What ways are there to get back to the city center after the concert?

Any help would be nice!