Make a list of all your monthly expenditures: rent utilities phone cell phone internet groceries gas/transportation eating out personal items (shampoo, razors, toilet paper) entertainment (dates, movies) clothing
Step2
Divide this list between fixed items (like rent) and variable (eating out).
Step3
Total the cost of the fixed items.
Step4
For the variable items, look at bank statements and receipts to make an educated guess as to how much you spend on these things. (It may befit you to consciously save all your receipts for one month prior to creating your personal budget.)
Step5
Total the cost of the variable items.
Step6
If you're looking for ways to save money, you might try to cut out all the "extras" for a week. Things like bottled water, gum, mints, lattes and sodas really add up! Then find ways to cut out or cut back on those extras. Use a refillable bottle for water you purify at home. Buy gum in bulk. Don't buy sodas on-the-go; buy a case at the store and stick a few in your car.
Step7
At the beginning of each month, prepare a list of your predicted expenditures--both fixed and variable. Try to stick to that predicted list. If you're trying to save money (and who doesn't need some extra cash), consider using cash only and saving all of your receipts. Some people find it helpful to put cash in designated envelopes for each expenditure (groceries, transportation, eating out, etc.)