Do not ever forget that YOU are responsible for repairing and maintaining your property. Unless you do it all yourself, that's going to cost you X amount per year. If you're smart, you'll save that much every year in an interest-bearing account for those untimely emergencies like the roof leaking, plumbing going bad, etc. Figure out replacement costs for your roof and other parts of your house (I'm assuming house here) and then amortize it over the expected number of years. Otherwise, you're going to have huge charges on your credit cards or a huge hit to your savings account at bad times.
Also, find out upfront roughly what your tax bill will be per year. If you don't pay your taxes, eventually the local government is going to take your home. That's the way it is. The taxes might go up and/or the value of your home might go up, which will cause your taxes to go up. Same advice as above, save that money every year in an interest-bearing account. Pay your taxes immediately when they are due. I get a 4% discount for doing that promptly, and you might also. At least you get it off your mind and the taxes are paid.
Every month (if you're smart) = Principal payment + interest payment + taxes set aside + repair/replacement costs set aside + regular maintenance costs (lawn, pest control, etc) + other fees set by your lender.
Best wishes and good luck, it's much better than renting if you can afford it! 
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