First concert. advice?

Ok so im probably going to a hawthorne heights concert on the 3rd of august so its my first one and i really dont know how anything works. Like how to get good tickets. Do you stand up the whole time or are there seats. Are there any merching stands or anything. Are mosh pits really dangerous? etc etc yeah yeah. Anyway any other advice you guys can please give would be great ^^. Thank you's XD