¿Quieres comprender castellano? ¿Le gustaría hablar con GAF Bilingüe? Déjame que te cuente cómo aprenderlo:
The best way to learn any language is immersion. They're is simply no substitute if you want to get beyond conversational adequacy into the realm of fluency. Therefore, my recommendation is to plan a trip overseas and force yourself into a sink or swim environment. If you're truly serious about it, you've got to spend some significant time among a Spanish-speaking population. If you're fine with not becoming fluent, then just find a friend who's willing to practice with you. Rergardless of which path you choose, the
only way to learn the language is to spend a lot of time working on it, and practice speaking with native speakers regularly. My serious disclaimer before my recommendations for study: If you're not willing to put in significant time, don't bother.
As for the method of study itself, here's what the best course of action is in my opinion. Start by spending a bit of time familiarising yourself with the 1.)
phonetics of the language to build a strong sense for the sounds of speech. Why do you I recommend this? I live in Buenos Aires at the moment, and the city constantly has tourists. Some of these tourists bravely attempt to speak with locals in Spanish, but the truth is if you have a thick accent,
o si usas diptongos como los estadounidenses, the people here are going to find it mildly irritating. They appreciate the effort, but it's insulting if you don't at least try to get into the sound of the language.
After briefly practicing the phonetics--or even simultaneously--start chugging away with the 2.)
grammar and conjugations. Spanish has many more conjugations than English, so it takes time and patience for these to become second nature. I made a cheat sheet when I was first learning Spanish, but the only way to really get them down is to use them. You've got to be willing to make mistakes. Most people won't correct your grammar unless you ask them to, so try to find a friend who's willing to practice speaking in different tenses with you. Finally, once you have a firm grasp on the conjugation and the different sentence structures, continue to acquire a wider 3.)
vocabulary, and force yourself to 4.)
practice, practice, practice. If you keep a tiny journal in your pocket, you can write down words you don't know or questions you have, then take them to a Spanish friend who can help you out.
Here are some tremendously helpful sources which I used on my path to fluency:
http://www.studyspanish.com/tutorial.htm This site has nearly comprehensive lessons to the grammar and conjugations. It is absolutely worth your time to use it.
http://www.123teachme.com/spanish_verb_conjugation This site lets you type in the infinitive form of a Spanish verb, and it gives you all the conjugations in their different forms. Very useful indeed.
¡Que tengas suerte!
Edit: One last disclaimer: Plenty of friends and good-intentioned people have loads of advice on the best way to learn Spanish, but very few actually walk the walk (or perhaps in this instance, talk the talk). Take all the advice you receive with a grain of salt. The above is what worked for me. I'm originally from the U.S., but I have locals here in Buenos Aires ask me for directions constantly, and people only know I'm from the U.S. if I tell them. Basically my point is, you should listen to my advice. ; )