To make english learning hapenned (questions)

• Is it interesting or harmful a bilingual project or a subject in English?
• Is it a good idea going abroad to learn English?
• What could we do if we had different levels of English in class?
• How could  we divide our classes? Taking to account their age or they English habilities?
• Which would be the criteria to mark them? According to their English level or their effort?
• Should we obligate them to speak in English in class?
• How could we organize the class? Sitting in circle, in groups, individually...?