One of the most important elements of planning your wedding is setting a budget (unless of course your budget is unlimited and in that case, lucky you!). Before you make any wedding purchases you should set your overall budget and then you can begin to see how much you want to spend on each element: dress, flowers, venue, etc. You will be less likely to overspend if you have a set budget in mind.
And don't let the word 'budget' scare you! You can have a fabulous wedding without spending a fortune. Your wallet, and probably your future husband, will thank you afterward.