Getting Married. Need Help BADLY!!!

Hello. I am getting married in October to my Military man. We are getting married at my church and I need some advice. I don`t want to spend a lot of money and I already have someone making the cake, photographers and someone doing the punch. Can someone tell me how I can do the flowers and things like that. I will take any advice on anything! Hahaha. My colors are red, black, and silver. Thanks!