Below is a list of ritual items, foods, and recipes you will need for a Rosh Hashanah seder.
Ritual Items
Candles and handle holders
Kiddush cup and wine or grape juice
Challah plate and cover
Rosh Hashanah seder plate or any large plate to display the foods
Special Seder Foods
Dates
Pomegranate
Green beans
Pumpkin or squash
Beets
Leeks or scallions
Fish head or head of lettuce
Apples
Honey
Challah - often round and with raisins for Rosh Hashanah
Recipes
Check out the food blog, Afooda, written by an Israeli woman of Tunisian descent. In her commentary on her recipes for Rosh Hashanah she writes about the seder.
My Jewish Learning also has many Rosh Hashanah recipes using foods for the seder:
Pomegranate Brisket with Cranberry Succotash
Beet Chips With Spicy Honey Mayo
Green Beans with Honey Tahini Glaze
Roasted Beet and Leek Rissotto
Pomegranate And Honey Glazed Chicken
Roasted Beets with Cilantro-Basil Pesto
Black-Eye Peas With Turmeric and Pomegranate