Avenged Sevenfold concert?

I'm going to the uproar festival with my 17 year old brother and I'm 13 but this is my first concert and I'm like nervous about it because I have no idea what to expect or what to do >.< the concert is in Buffalo, New York and it will include avenged sevenfold , bullet for my valentine , escape the fate , three days grace , seether on the main stage. I'm going sept. 10 and I would reallyyyy appreciate some advice <3