April Wedding

If anybody has any ideas on how to make a wedding that is going to be held in the same room that the reception is going to be held in, please give me all of the ideas you can. My guest list is going to be around 150 people. We are sectioning of part of the room for the cerimony and the other part for the reception. It is a pretty good sized room, but I`m not quite sure on how to decorate it without spending money that I really don`t have. Thanks so much for any advice you can send....