Fulani braids are cornrows and hanging braids in one install. A cornrow runs down the centre of the head, side rows are braided toward the face, and individual braids hang at the back or all the way around.
Beads, cuffs and shells belong to the tradition, not an add-on. Bring your own, or ask what the salon has.
The pattern at the front is where the time goes, and where a braider's hand shows. The back is usually priced like a knotless or box braid install of the same size and length.
Ask how the back is done. Some salons braid it knotless, some do box braids, some crochet or sew in hair at the back, and the price and chair time move with it.