rates and circumstances vary greatly and Rob made some excellent points. I usually anicipate about 2.5% of the amount financed to be the closing costs.
the total settlement amount covers your prepaid amounts since you will pay some interest forward, in lieu of making a first payment, which generally is due in the following month and would include any tax escrows. These, of course, are added to make sure that when the taxes are due in May, you will have enough in escrow to cover the 1/2 yearly amount.due. You may or may not want to roll the closing costs into the mortgage
good luck! Don't be afraid to ask questions and get answers that are clear to you Liz