Welcome Nev,
my personal advice would be "let it happen"
you will get a pocket guide and a con book at registration, have a look at those, but don't plan anything solid.
As in do not attempt to plan your day back to back, I would suggest you just mark some things of interest and decide on them from time to time on a day on the spot.
Personally I share the view that it is very hard to actually get to all the things I want to go to (on time) with all the other nice spontaneous things popping up.
And go "taste", just try some panels, events, gatherings and function rooms (like the dealers den), try walk in there and see if it is something for you.
Maybe some events benefit from a more closed social gathering, but on average just walking in and walking out is a very normal thing to do and gives you a chance to "see what it is about" and a next time you might want to attend the full experience. Some events like a fire pit (if weather permits it) and Game Corner happen multiple days for example.
Maybe search out some people, suiters, people drinking and if you feel comfortable with them, ask them if you want to share some lunch, dinner or some of the open events and dances.
You will be surprised to find what Berlin has to offer and what experiences you can enjoy that are not organized directly by the con.
And if you feel like having some more quiet time, stroll through the art show in between.
Or chat up some of the volunteers, assuming they have the time they will tell you about places of interest nearby to go to and enjoy.
