Traditional wedding roles for the bride

Chooses wedding date, type of ceremony, the theme of the wedding and her outfit
Chooses her attendants and their outfits
Co-ordinates and advises other members of the bridal party on dress codes, colours, etc
Throws her bouquet amongst the unmarried female guests
Writes thank you notes to helpers and for wedding gifts
Buys a wedding present for the groom

But remember: these are only the traditional wedding roles! If you want to change them, go ahead!