Just about geared my Gladiator warrior but I realized how bad i am in an arena setting. How did you guys learn and get better with PvP arena mechanics?

Experience, you wont ever get better by standing there reading and not playing.

get camped while leveling

glad prot warrior is pretty basic. There is no stance dancing at all now, it's not even allowed. There's only a couple abilities. More or less, attack... and manage ur cooldowns since there all more or less damage or damage reduction abilities, minus like spell reflect.

Don't get kited.

Oh if ur using heavy reprecussions on a glad prot warrior, use shield charge, with it for solid burst with a avatar or something. You can make shield slam hit pretty fucking hard.

Just play pvp and you will get better, learn classes and when to cc/interrupt etc.