TPR(Total Physical Response) and (TPRS) Teaching Proficiency through Reading and Storytelling
TPR and TPRS are special techniques that expose students to intense repetition of basic structures and common vocabulary in the second language.  Translation, gestures, illustrations, physical imitation, and circling with simple questions ensure comprehensibility while the instructor speaks Spanish.  Humorous and unexpected situations maintain interest so that each student gets high-frequency exposure to the language. 
The 3 things you need to learn to speak Spanish:

To Listen
"...the reason that children end up as native speakers is because they learn to speak by listening.  And the reason adults don't is that they learn to speak by speaking."
J. Marvin Brown, Phd
Second Language Acquisition
AUA Thai Language Center

To Have Comprehensible Input
"...the Input Hypothesis is that language is acquired in only one way - by understanding comprehensible input.  Most language education is fundamentally flawed by procreating the assumption that the best way to learn to speak is by speaking."
Stephen Krashen, Phd
Second Language Acquisition Linguist
University of Southern California

Listening is only effective if a student undertands what is being said.  It is important that an immersion class not become a sophisticated game of charades.  Research shows that the more you struggle to remember a word on the tip of your tongue, the more difficulty you'll have remembering it in the future.
(McMaster University Study, Hamilton, Ontario)

To Invest TIme
Time makes a difference! A baby is exposed to his/her native language at least 17,000 hours by the age of 6.  Students are lucky if they get 150 hours of the second language in two college semesters - not counting the time wasted on grammar explanations in English.  Every hour that a person is engaged with the second language is vital to the eventual acquisition of Spanish.