There are wedding planners that cover decoration for you. Some venues has its own decoration, but extra service provides you customised decor according your wishes.
Budget limits a lot of couples to have their dreamed wedding. Make your priority list. What is most important part for you. But remember any weak piece in your wedding "chain" can cause disaster. Top profi decor needs to be photographed well, your make up and hair style have to be perfect till the end and your dress, music and food....check other vendors too.