New Year's Eve in Berlin and Luggage Storage [closed]

We, a small group of 3 people (19 years old), are looking to do new year's eve in Berlin. We will arrive at around 14.00 and we will have a flight back at 07.35 on 01/01/2018.

We are arriving from Leipzig and we are on kind of a low budget. We thought about leaving our luggage in the SXF airport, but the storage is under maintenance (checked with them and will still be in December). So we were thinking about leaving big luggage in the main station on 31/12, and take it back in the early morning of 01/01.

We have some questions that we hope you could answer:

Is the Branderburg Gate the best place, even for young people? We love techno and know that Berlin has some good places, but we think that on the 31st of December it may be not the best thing to do to go in a disco club.
Is the main station the best place to leave luggage, and will there be space for them? Are we going to be able to pick them up in the early morning?