You can ask your agent for reccommendations, or contact your local bank that you do business with. I can also give you some info, if you contact me through my website.
You will need to prived basic information, income, debt,etc and then the lender will tell you the maximum amount you qualify for, based on your downpayment and credit history. That is just your guide. You know how much debt you are comfortable with, so then you decide how much you mortgage.
Being pre approved presents you as a serious buyer to any seller.
Good Luck in your home search.
Basically you apply with a mortgage provider and they will tell you how much you qualify for and what price range of home you can shop for. This is done for free with most mortgage brokers with no obligation. If you need some references for good mortgage brokers who I have had good results with, contact me through my website and I'll give you 2 or 3 possibilities. It is an excellent idea to do this before you shop. You don't want to learn anything disappointing once you get excited about a home.
Again it doesn't cost anything except 15 minutes of your time on the phone and you'll find out exactly where you stand.