The answer is going to depend a lot on what you already have and what you are trying to do, and it is hard to give a solid answer without knowing the specifics.
- Are you a coffee producer?
- Are you planning to broker the coffee buying it from producers?
- Do you have an empty field where you intend to grow coffee, or a
warehouse full of green beans?
- Are you looking to sell the coffee to brokers, roasters, micro roasters, or retail?
- What quality of coffee do you have? Specialty coffee, or
Depending on the answers to these questions, you may want to reach out to green coffee importers, to specialty coffee shops & roasters, or coffee buyers, or you may want to take your coffee to auctions like the cup of excellence, or start by becoming a Coffee taster ...
There is more than one way to get into the business of exporting coffee, getting the right coffee and known when you've got it, and how to take care of it once you have it (supply) are as important as getting the right buyers and making sure they know they are getting the right coffee and keeping them hungry to buy more of your coffee (demand).
Most countries that grow coffee have institutions aimed at helping producers succeed at exporting their crops, so looking around your local landscape for such institutions, other exporters and producers, etc... would also be a good way to start. A quick google search yieled some interesting pages like Yemen coffee that could give you a few hints on where to get started.