Rosh Hashana 4:6-7
Rosh Hashana 4:6
There is a minimum of ten verses each of malchiyos, zichronos and shofros. Rabbi Yochanan ben Nuri says that if one recites three verses of each, he has fulfilled his obligation. We do not recite verses about remembrance, kingship or shofars that have negative implications. We start each set with verses from the Torah and we complete with verses from the Prophets. Rabbi Yosi says that if one completes with a verse from the Torah, he has fulfilled his obligation.
Rosh Hashana 4:7
Of the people who lead Rosh Hashana services, it is the second person (i.e., the one who will daven musaf) who leads the shofar-blowing. On days when Hallel is recited, the first person (i.e., the one who davened shacharis) leads the recitation of Hallel. (Hallel is not recited on Rosh Hashana.)