Tips for going to an All Time Low concert?

I am going to an ATL concert in early August, and this is my first concert. I need some tips. Should I wear jeans or shorts? A t-shirt or tank? How long should I wait for the band to come out after the show? Should I bring a sharpie and and a CD cover for signatures? If my show starts at 6 what time should I get there to be in the front? Any other tips would be awesome! Thanks!!! :D