Having an organised approach from the beginning will be beneficial in the long run. There are some key decisions that need making and being decisive will certainly help, although with Asian weddings and the input of so many people can get rather frustrating. Once you make a decision try and stick with it because ultimately you will start losing credibility not just with family but with suppliers too. 

First of all, discuss with both sets of parents the kind of wedding you are planning and what exactly you will need for it. Discuss a budget, which is mutually agreeable.