Travel / TRAVELLING FROM GDANSK TO BERLIN BY TRAIN INFO [4]

I am travelling from Gdansk Glowny to Berlin HBF on the 16th of June at 6:40am and I have a few questions?

Will their be any food shops open at Gdansk Glowny at this early in the morning?

How do I find my platform? Is it clearly labelled on a big board?

Do I need to validate my ticket? My ticket already has all dates and names on it as well as stations?

Thank you

Travel / MEAL PRICES IN GDANSK [4]

Can someone give me a rough idea of how much it is to eat in gdansk?

what about a can of coke?

a big mac meal for example?

cheers in advance