Planning your budget
Write down everything you spend over a couple of months/weeks, so you can learn exactly where your money is going (e.g. rent, mobile, Foxtel, electricity, gas, car running costs, groceries, gifts, clothes, insurance etc).
Make sure you are honest about your expenditure and what things cost - it's better to overestimate rather than underestimate so you don't get caught short. If you don't know exactly how much you spend on something, e.g. electricity, make sure you review past bills and calculate annual costs to determine an average amount. And don't forget to factor some 'fat' into your budget for surprises (e.g. the unexpected night out).
Once you've finalised your budget, check your bank records and reflect on your strategy regularly to make sure you're meeting your financial goals.