Choose the website you will be using based on your needs and level of Spanish ability. SpanishDict is highly recommended for those just starting out. Try a conversation and language exchange from Lenguajero if you're feeling more extroverted. Both sites offer their services free of charge but require registration.
Dedicate a certain amount of time daily to practice your language ability. Take into consideration your present level of ability and the time frame that you have when determining the amount of time you need. For conversational Spanish, start with basic greetings, questions, and commonly used verb conjugations.
Take advantage of any offline lessons or materials that your chosen site offers. Backup materials that function offline will allow you to continue your lessons in the event there is an interruption of Internet service.
Keep a notebook and pen handy for conventional notes. Conventional notes are still useful, especially if you are a beginner and are chatting with a friend online. Take notes of any unfamiliar words and phrases that you may hear during a conversation or a video or audio lesson.
Use the links provided by your chosen website to broaden your horizons. These useful links can be found in the reference section of Spanish Dict and include technical support, multimedia and learning resources. Lenguajero also has a resources section organized by learning ability, level and type (written, interactive, online) that includes music, podcasts, and Spanish for kids.