The token won't copy counters, Auras, or Equipment on Sorcerer's Broom, nor will it copy other effects that have changed Sorcerer's Broom's power, toughness, types, color, and so on. Normally, this means the token will simply be a Sorcerer's Broom, but if any copy effects have affected that Sorcerer's Broom, they're taken into account.