WordNet sense 1 (someone new to a field or activity):

beginner, novice, tyro, tiro

WordNet sense 2 (someone who has been admitted to membership in a scholarly field):

pundit, savant, learned person

WordNet sense 3 (people who have been introduced to the mysteries of some field or activity):

enlightened

WordNet sense 4 (accept young people into society, usually with some rite):

induct

WordNet sense 5 (take the lead or initiative in; participate in the development of):

pioneer

WordNet sense 6 (bring into being):

originate, start

WordNet sense 7 (bring up a topic for discussion):

broach

WordNet sense 8 (prepare the way for):

lead up