Most programs are pure crapola. Avoid them.
If your idea is fluency, give it up. That takes about 6 months to a year if you are constantly surrounded by it daily. If you are lucky, maybe less. You can learn just a ton if you were fully surrounded for 6 weeks, but you probably wont be, so lets try to help. Recommended Materials past the following fluff advice.
Is it possibly to become fluent in Spanish in the US? Yes, it is. It's probably one of the only languages where this is possible and maintain it. You have so many good learning materials, so many people, tv channels, radio sations, etc., now that you can actually become fluent without leaving the US. It can be done. People have done just that because they didnt have the money to run away to a different country for a year.
I am in the process of my own immersion program right now. Am I able to be surrounded 24/7? No. I just do what I can.
I was able to teach myself the whole first year of College Spanish in 2 and 1/2 months, so it obviously works. You just need excellent materials and a good plan. You must also be dedicated.
Why am I doing this? Well, typical school languages classes suck and are a waste of time not to mention money. This is unless you go to an awesome program like Berlitz, Don Q., the Government programs (though you have to be in the Government), etc.
Remember those language classes you took in High School? Anyone remember much in those 1-4 years? Proven fact. These types of classes are a pure waste of time. They fail close to 100% of those who take them. Proven fact. Why they are even required is a mystery. No one seems to remember a thing as it is. Why? Well, your not even taught how to speak first. This is quite obvious? In English we didnt exactly learn how to read English Literature without knowing how to speak and say simple sentences.
If you plan on not sounding like a total goon, you best learn how to speak and learn all the naunces of the language before you learn to read. If not, you will sound like an American Gringo with a horrible accent. This is because you will be prouncing things the way you would in English. It grates on the nerves of the natives. You will be called everything under the sun.
Here are some materials you can try.
Listening/Speaking:
Start Here:
1.
http://www.how-to-speak.com/?hop=normjack
Excellent Program. Costs $19.95. Will teach you over 3000 words in 30 days. And yes, it does work. Brilliant program. You also get a personal coach for 30 days as well as native lessons (so you can start to learn to speak like a native).
Next try these (All are expensive. For the serious only):
1. Learning Spanish Like Crazy Lessons at
www.learningspanishlikecrazy.com
(Follows the pimsler approach, but is even better with more explanations and very up to date. Just made this year. Will teach you to speak everyday spanish. Will also teach you dirty spanish if you want to know it.)
2. Pimsler Comprehensive 1-3 (Watch out for some outdated things). These are typically formal courses. They teach how to speak formally, not everyday speech.
3. FSI Levels 1 & 2. Boring. But you should not have too tough of a time if you did the others first.
Some material for Grammer and beginning reading which work great:
Start Here: (The Best Ones which are fortunately not expensive at all. They actually beat many higher priced ones. They are worlds better than any textbook I have seen. Then again unfair comparison. Textbooks generally suck.).
1. Madrigals Magic Key to Spanish ($10). A few things are outdated. This is from the 50's, but is way ahead of it times. Accelerated Learning. This book is a goldmind for the beginner.
2. Dorothy Richmonds Verb Tenses (Mastering Verbs is extremely important). A Diamand Mind.
3. Dorothy Richmonds Pronouns and Prepositions. Another Gold Mind of info. Will save you many mistakes.
P.S. Avoid "Michel Thomas Lessons" unless you are looking for a good laugh. The quality of instruction is good, but his accent is bad. Never learn from those with bad accents. He also constantly yells at his students. I laughed my way through these. He sure is a cranky old bastard.
Once you finish all of this, you should be at an Intermediate Level of Speaking and you will be able to begin basic reading with ease.
Basically immerse yourself. Listen to the radio. Find Spanish tv that seems interesting to you. Read Household Labels, learn new words everyday. Etc, etc. There are so many different ways to teach yourself this language that you shouldnt loose interest.
Childrens books are a good way to teach everyday basic vocabulary as well. Basically, expose yourself everyday to the language and you will make excellent progress in a short time.