Take a language class. This gives you the opportunity to learn from a professional and interact with other students, giving you a chance to practice the language. The instructor will assign projects and assignments that will help you learn outside the classroom.
Use language CDs at home, in your MP3 player and in your vehicle. This will help you learn the language in an auditory way, which is the best way for many people to learn. Practice repeating the words using correct pronunciation. The more practice you have, the better.
Utilize language learning software to help you practice at home. There are many programs available that can be extremely helpful in learning a new language.
Travel to the country where you wish to learn the language. While this is not feasible for everyone, spending time in a location where you hear the language and are forced to use it can be an extremely helpful learning tool. If you cannot travel to another country, try to find someone in your town who speaks the language. He could help you practice in return for learning your language.
Make flash cards with common phrases and vocabulary on them. Keep the cards on hand for times when you are bored waiting in line or have some time to spare.