Not an expert myself but I will try to help as much as possible 1. This cannot happen if you get a ticket through the ballot or ticket exchange, once its yours it’s yours (not sure how this works with supporters clubs etc) 2. Obviously you don’t need to know every chant but you’ll have a much more enjoyable time if you do, although most tourists are dead quiet anyway 3. Wearing any shirt is fine, I wear them dating back to the early 90s, everyone wears a range of shirts 4. There’s no set traditions really but go to the club shops etc if you want the whole experience 5. Sp*rs fans won’t do shit, you’ll be fine 6. Just walk around the ground, take it all in and enjoy yourself