After you have track your spending for a month, you now have the information you need to create a monthly budget. Now you know exactly how and what you spend your money on. If you did not have a surplus of money at the end of the month, you can now see area where you can trim your spending in order to operate you budget with a surplus next month.
I've found that when creating a budgeting worksheet the best way to start is with a set up like this; _ Firstly, place your pay dates along the top (shown from A1 to G1). These can be weekly, fortnightly or monthly or any period that you normally work from. _ Then list out each income source and the amounts you receive from them. For irregular payments such as Christmas bonuses etc set up a row specifically for this and maybe name it "Other Income".