Need help - Barcelona tickets!

Go easy on me here as I am an American just learning to appreciate and enjoy European football. I have been to Europe many times. However, I am actually going to experience a football match for the first time ever on September 26 in Barcelona! I stayed up late here on the west coast (now past 2 am) just to get my tickets for Barca-Zaragoza as they were released for sale tonight (10 am Spain). Happy to say I got seats in Lateral 2 Sec 335! Hopefully, these are good seats!

I have a couple of questions. Being outside of Spain, I have to pick up my tickets from the ticket office since I have to show my credit card. I looked online but still not sure where I need to go to pick them up. Also, I will take the Metro to get there on L3 or L5. I assume the best stop is Collblanc (L5) or Palau Reial (L3). This depends on where I need to go to pick up my tickets. Can anyone help me with this as to where I need to go?

Thanks for your patience with me and for those of you who helped me figure out where I should sit, I appreciate the help!!!

Les Corts is the stop I have got off at on the couple of times I have visited the Nou Camp. I am not 100% where the main ticket office is. Spanish stadiums have a number of Taquillas around the circumference of the stadium, and the Camp Nou has loads, so I guess you can go to any of these, but perhaps there is a main office for ticket pick ups. I am sure Cule or Oleguer would be able to expend on what I have written.

The main ticket office is the one at Access 14 which is on the side of tribuna. The closest stops are Collblanc on the L5 (the blue line) and Les Corts on the L3 (Green line). If you have any problem you can go to the OAB (information office).

I made a crappy map, the circle is where the main ticket office is and the spot is where the OAB is. The L5 in the grey zone of the map is the Collblanc stop and the L3 one is Les Corts, hope it helps.

Thanks for your help.

I thought Maria Cristina was the nearest station for the ticket office - that's the station I used when I went to Nou Camp but I defer to Barcelona residents.