You have to first breakdown all the things involved in developing the app. Keep in mind that it is very important for you and your app developer to have a complete understanding on what the app is all about. The lack of proper communication and comprehension on the matter will greatly affect the app in a negative way because if the developer does not fully understand what you want then he cannot give you the end product you are expecting. You are the brain of this operation and the web designers Sydney would be the hands wherein the hands can only do what the brain asks it to do.
Apps that come with a vast number of features are most likely expensive so if you are on a certain budget, you have to make compromises like lessening the functions found on your app. If you must do this, give more importance to the main features of the app. During the entire process of making the app, you must keep in mind the main reason why you created the app in the first place because this will be the basis of the final product. To learn more about web design, you can visithttp://en.wikipedia.org/wiki/Web_design.
Another thing you need to take into consideration is that the price of the services of an app developer may vary from one area to another. It is very directly proportional in the sense that if you live in an area wherein the cost of living is cheap, then you ought to expect that the services you find will also come cheap. Western countries are known to have a high cost of living so if your app development is from around that area then you better get your bank account ready for some big chunks of money taken out of it.
The time zone may also affect the decision you make in hiring a developer of your mobile app. If you get an entire team to do the work, it will be done in a shorter period of time and even if you have to pay more people, you actually still get to pay lesser.