1. 诸位女士诸位先生... means ladies and gentleman
2. 朱军 em...i thought you typed wrong...it may 诸君[emoji]but it's too hard to use it in suitable situation
i suggest some of words for starting:
1.大家早上好,我很荣幸在这里能见到你们。(Hello everyone,good morning,i'm glad to see you here today)
2.女士们先生们,早上好,我叫。。。。欢迎你们来到这听我的演讲。(Ladies and gentleman,good morning,my name is...welcome to come to here today to listen me presentation)
Hope that help you~