How to get in the away end at a football match?

Basically, I used to live in Newcastle when I was much younger and my Dad would always take me to see them play. I now live in Plymouth and I'm much older now. Newcastle are coming down to play Plymouth a few games away from the end of the season and as I've never personally bought my own ticket for a football game, how do I make sure I'm in the end with all the other Toon supporters. I mean, I wouldn't mind sitting in the Argyle end lol but I don't wanna start celebrating when Newcastle score a goal when I'm in the Argyle end. :P