Ahead of the month of Tishrei, detailed Halachic Guides have been published by Rabbis Yosef Braun, Aryeh Citron, Shmuel Lesches and Chabad.org.
Day-to-Day-Guide-Tishrei-5780-part-1לוח-יומי-תשרי-תשפ-חלק-א
Chabad.org-luach
Laws-and-Customs-Citron
Laws-Customs_-Rosh-Hashanah