Stop by a local bookstore. Look through books in the foriegn language section for one that appeals to you. A set of books I like are "Teach yourself" It's best to find something with audio so you can also listen to the language being spoken and that is
very important.
Once you start to understand grammer and learn words, immerse yourself in that language. A great way to do that is to watch TV from that country if you have a broadband internet connection there's
http://www.tv4all.com
The best thing you can do is to find someone who you can talk to in that language. Practice, Practice, PRACTICE!!! Learning a language is a lot of work. I myself speak decent German, halfway decent Russian, and a little bit of Italian, Korean and Japanese.