Your monthly payment depends on several factors. For the basic principle and interest payment, use this mortgage calculator. https://www.lionbank.com/financial-tools
You will also need to know the property tax and homeowners insurance premium to add to the P&I payment. Property tax may be provided by the seller, but if not, the information is available from the tax commissions office for the county where the home is located. Homeowners insurance quotes are available through many insurance companies. Usually, a discount is available by using the same company for homeowners and automobile insurance.
At closing, an escrow account will be established as part of closing costs. This is used to provide funds to the mortgage to pay taxes and insurance as they come due.
For FHA financing and all loans for more than 80% of the purchase price have a mortgage insurance premium added to the monthly payment. A loan offer can give the exact amount.
When inquiring about financing, it’s important to consider the down payment, interest rate, mortgage insurance, and lenders closing costs.
Aside from the lender closing costs, the other expenses on the Good Faith Estimate (provided by the lender) called pre-paids and will be the same for any lender, even though some may give a lower estimate of these expenses. Pre-paids include a few months homeowners insurance and propety taxes to establish the escrow account. At closing you also have to pay the premium for an annual homeowners insurance policy.