Please help me! I'm going to teach speaking for a group of beginners. This course will last 16 hours within a month. I find it hard to choose an appropriate course book or materials for these learners. I intend to cover one topic per day for them, such as the first day they're going to study the alphabet and numbers, the second day I'll introduce how to tell the time and date. I don't know whether it's good for them or not. Give me some advice.