Prior to consulting with a Realtor, I would contact a couple of Lenders and sit down with them to go over your financial status. He/she will be able to let you know how much of a home you can afford.
Once a figure has been determined, then you would contact a Realtor to assist you with finding a home to purchase. Most Realtors are going to ask you for your pre-qualification letter from your mortgage lender prior to showing you homes.
Choose a Realtor that you are comfortable working with and that listens to what your needs are.
Take your time and don't rush into purchasing a home.
Happy House Hunting!