First Day of Rosh Hashana

Tashlich is recited after Mincha, before sunset (6:04pm). [If one is late, he may recite it until the stars emerge.]

After Tashlich, one shakes the edges of his Tallis Koton.

One should not throw food to the fish.

If possible, one avoids eating the meal after the beginning of the tenth Halachic hour (3:10pm), so that one has an appetite for the Yom-Tov meal of the second night.

One may not perform any preparations on the first day for the second night and day of Yom Tov.