Hi, Peter Dun Splyce coach here. Some quick things about Berlin studio:
First welcome to LEC, going first time is always memorable.
1) If you want the VERY best seats come early. There's no seat reservations unless you are invited by a teams (then you sit underneath the seating stands in front of the stage). However, there are multiple massive screens which show the game and you can see those from anywhere in the studio. You don't have to be there for all the games. However, the studio is normally packed even for the less popular teams so if you come later you won't get a choice for your seat (although even the bad seats are still fine).
2) Winning teams will do a fan meet after the game where you can queue up and take pictures. Most teams (not 100% sure about FNC) will let you take 1-2 pics with someone even if they lose provided you msg them on social media before the game, especially if it's your first time out there. Also the casters are all great and friendly for this. Just be aware that players might not be so happy after a loss (losing sucks and sometimes you just want to be by yourself after a loss). Fan meets are inside the arena next to where the seats are (this is different from NA).
3) You can come and go when you want. Also, normally if you put a marker like a balloon on your seat noone will take it if you go for a fan meet.
4) People say the food is not so great at the studio (personally I didn't have a problem with it) but as far as I am aware you can just bring a supermarket sandwich in or something if you are concerned.
5) There are plenty of security staff who you can ask for help if you get lost, and they all speak fluent English.
6) Anything else....hmmmm. If you want free stuff when they throw it into the crowd don't sit right at the edges or right in the middle. Generally sitting 15-35% across from either side, around half way up (slightly in front of half way if you are tall), is the best place to catch them. (Trade secrets ;) )