Lots of ideas here. Your breakdown of expenses will of course depend on what stage in life you are and the kind of lifestyle you live.
Since you will just be starting your first job, I take it that you are still single and most likely living in your parents' house? If that's the situation you are in, this is the best time to SAVE most of your income because you have little expenses to think about (no rent, no utility bills, no groceries, no allowance for the kids, etc.).
So when you breakdown your salary each month, set aside most of it in savings. You can do something like this:
- Food (I suggest you separate this into two: one budget for food that you MUST spend on like lunch, and another budget for food that you don't really have to spend on but can't help it, like coffee with your officemates. That way, you can see where you can cut back on and save more money)
- Transportation (gas/parking if you drive to work, bus/jeep/fx/taxi/tricycle fares if you commute)
- Beauty Related Expenses (haircuts, manicures, etc. things you need as beauty upkeep)
- Health Expenses (if you take any vitamins or medicine)
- Office/Work Related Expenses (if you have to buy office supplies that aren't given to you, that cute trinket for your desk, or post-it notes for your reminders)
- Groceries and Toiletries (things you buy for yourself at the grocery store)
- Clothing (for your new office wardrobe of course)
- Cellphone bill or load
- Entertainment (movies, gifts, dates, gimmicks, etc.)
If you give money to your parents, give to charity, own credit cards or anything of that sort, of course you have to set aside a category in your budget for those as well.
Also don't forget to include things you spend for or might spend for on a less regular basis like travel and insurance payments.
I also suggest you try keeping track of things through budgetpulse.com. You can input ALL of your transactions whether it's income or expense, make a budget, and keep track of your net worth.