All this depends on the house you are purchasing.
Call your insurance company - they will ask you questions about the house and give you a quote on a yearly premium.
In addition to insurance, you have to pay state and city taxes. You might not have to pay state taxes if your home costs less than a certain amount. Call your local tax accessors office and they can give you the exact amount of taxes you have to pay.
Remember, if you are a first time home buyer, most mortgage companies will require you to have Mortgage Insurance. This basically protects them in the event that you stop paying your notes. I would estimate the insurance to be between 30-80 bucks a month.
Soooo your loan payment, plus taxes, plus hazard insurance, plus mortgage insurance will equal your payment.
As for closing costs, you should estimate it will be 5% of the total price of your house. It is a combination of attorney fees, a years insurance premium, inspection costs, termite certificates, etc.
Your lender should be able to provide you with what they call a "good faith estimate" That document outlines your note as well as your closing costs.