How did you really learn a foreign language?
phicou: I learned an unfamiliar language while spending two years in the Peace Corps.  They have had many years to refine their language teaching materials.  Still, I only learned the basics after 2 months of very intensive training.Once I knew the basics, I was able to learn a bit more from friends and neighbors, especially children.
Eventually I ended up dating and marrying a local.  Even though she spoke fluent English, we would try to use the local language for anything not too detailed.  This increased my vocabulary and comprehension.Once I was able to use and understand words, a book that described some of the theory and formalities of the grammar really helped improve my ability to express myself.  I went from "cargo cult speaking" to actually knowing why I was using the structures I used.I still don't know as much as I'd like, and for more complicated statements, I have to use English.For your situation, I wouldn't expect to get too much out of a "101" course, but if you really want to learn, you'll have many opportunities, especially with Spanish.  Try to talk to the staff at Mexican restaurants, and write down any words or phrases you don't know, to look up later.There is no substitute for hours speaking (and listening).  That will give you plenty of opportunities to learn new words, new idioms used by different people, provide plenty of opportunities for people to politely correct you, and most importantly, improve your confidence in your abilities.