不束者ですがよろしくお願いします (I'm inexperienced but please treat me well)

A humble self-introduction formula, traditionally spoken by a bride meeting her husband's family but used in any context where someone enters a new group. 不束者 ('clumsy/inexperienced person') + ですが ('but') + よろしくお願いします ('please treat me well'). One of the most iconic Japanese social phrases.