See if you can get Spanish lessons at your local college that will help you in your attempts to travel internationally. You may just need to take a refresher course or you may need to look into some of the other options that are available locally to you.
Look at all of the different self help Spanish lessons that are out there and see if they can be used to help you. Look at the reviews that have been posted about them online in order to help you to make a decision. Consider who makes them and how well recommended they are.