Some of these bills, like the electric bill, fluctuate depending on the month. For these types of bills you will need to average your monthly cost. You will also need to estimate your monthly food costs unless you keep your receipts each time you go grocery shopping. The total is how much money you have left over to work with each month. Look over your columns and realistically assess what can be trimmed or eliminated from your expenditure column each month.
Small changes can make a big difference.
For instance, if you buy brand name personal hygiene products change to store brands or only buy brands on sale. Bring your lunch to work instead of eating out. Rent free movies from the library instead of renting them from the video store.