Since you saw it in a taiwanese film, I think it means "organiser of a (mostly illegal) gamble". It's not used in standard chinese but a taiwanese slang. And it might not be "组头还没开始看中华 /之/ 棒", but "组头还没开始看中华 /职/ 棒". "中华 /职/ 棒" is the baseball league of taiwan. ; )

Upstairs agreed. This expression would sounds strange when it comes to Chinese, at least I've never heard of it in the mainland :)

The word (组头） is not a Chinese word."组头" is a Japanese word which means is a captain in a team.

组头 = zǔ-tóu= the leader of the group

臺灣用語，俗稱募集六合彩賭徒的頭兒，或與賭徒對賭的莊家。(六合彩: 一種起源於香港的賭博遊戲。)