Enroll in a free online Slovak language course, such as one of the ones offered by Live Mocha. Identify your goals for learning Slovak (travel, grammatical improvement, vocabulary), and focus your studies on that area.
Commit to spending at least 30 minutes per day working on your language skills. Review vocabulary on sites such as Slovakia: Heart of Europe, Let's Learn Slovak, or Slovak 101.
Utilize numerous different lesson plans for a comprehensive understanding of Slovak. As well as working on lessons at Live Mocha, follow along with the lesson plan at Slovak for Beginners.
Practice your Slovak language skills as much as possible. Take advantage of Live Mocha's peer-to-peer review system, and write back and forth with a native Slovakian to supplement your studies. Or use My Language Exchange to find a speaking partner for email correspondence, real time text chat, or voice chat.
Increase your practice time as you become more fluent in Slovak. Challenge yourself with tests, written practice and live voice chat.