First rule of thumb when buying your home is to make sure you are well qualified for the purchase. You will provide your lender with basic information regarding your debt, income, assets, and liabilities so you will know exactly how much purchasing power you have.
Knowing what you can afford is extremely important to ensure you are in a position of comfort and not struggle. There may be a wide array of financing options for you. Your lender will explain them all and help you make the right choice to best fit your needs.