I do not know about real estate in Jamaica, so you need to check with an agent in your area.
In the US typically the seller of a home contracts with a Realtor to sell his property. The most common type of listing (there are different methods) is an Exclusive Agency Listing, which means that the seller is only using this one agent to sell his home and is offering to sell his home and pay the broker that brings a buyer an incentive, called the Selling Office Commission (SOC). So in most cases the seller pays the cost of commission to sell the property.
Most agents who represent buyers work on a commission basis, meaning that the agent is not paid unless the buyer buys a property with that agent. In order to even the playing field, good agents and buyers sit down and work out an understanding that is formalized in a Buyer Broker Agreement, which allows the agent to represent the buyer and also states that the agent is entitled to a fee if the buyer buys a property.
I think the most important issue that buyers have is unmet expectations. Sit down with your agent and work out a plan regarding the type of home you want, your budget, location, etc. This can avoid frustration later.