What am I meant to do in court and what is it like?

I was at a park with some friends and had a bit drink, I was looking one particular friend and noticed a group of people up the top of a hill. So I'd walked up on my own and some random bloke pushed me over, I didn't provoke him or say anything and just walked off. Then he followed me and hit me across the face. I have witnesses and the police have photographed the injuries but I'm worried encase he'll get away with it by using his best mates as witnesses giving false statements or something :/
 
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