My recommendation is that you do not begin the process of searching for homes before understanding your financial and credit obligations first. Most financial institutions will require a minimum of a 640 credit score (non VA loans), and you will need to secure a MINIMUM of 7% of the total purchase price in savings to cover the DOWN PAYMENT and CLOSING COSTS. A 20% down payment will provide you with the best interest rate and will eliminate PMI (Private Mortgage Insurance), versus putting down the minimum of 3.5%-5%. If you are putting down less than 20% it will be required that you carry mortgage insurance with the lender, in most cases.
Once you have accomplished the above, it is time to speak with a lender to obtain a pre-approval letter, not a pre-qualification. An initial pre-qualification comes before your income and financial assets are verified, therefore not guaranteeing an approval of the loan. Having an approval of the loan will set an exact budget for you and your Realtor®.