Find out what currency you need before going to the bank. Check either online or with someone you know who has recently visited that country.
Allow at least a month to six weeks for your foreign currency to arrive.
Go to your bank physically. Do not plan on doing this online or over the phone as it is most likely that you will have papers to sign.
Tell the bank teller what currency you want and how much of your own money you want to exchange. For example, tell her you want $ 500 worth of euros.
Fill out all the necessary paperwork making sure your address is correct as the new currency will be delivered to your house.
Make sure you are home during regular business hours. Alternatively, you can have the currency sent to your place of business because you will have to sign to receive the package of foreign currency. Leave a trustworthy person at your house if you know you cannot be there to receive the money yourself and if your place of business is not the best place for you to receive packages.