If you are looking for a house, you need someone to help you find it. This means you choose a real estate agent to help your search. You explain to the broker exactly what you are looking for: how many bedrooms and bathrooms, estimated area and all special rooms / facilities that are important to you.
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You will talk about your desired location in terms of nearest services, shops and facilities, schools, and proximity to your work. They discuss the size of property you need for your lifestyle.
You then depend on this agent to sort through the hundreds of lists that are available and show you choices that match your description of the perfect home.
To ask someone to represent you when you find the house you want, you might want to hire a "buyer agent".
The agent will ask you to sign an agreement with the buyer's agent, who will then carefully look for a home that matches your wish list. He will call you when he sees something he thinks is perfect.
He will help you with your offer, negotiate on your behalf, and work hard to ensure that your closure happens without a step.
He will also work hard for you because he wants to win your loyalty and because he is truly interested in finding your dream home.