One of my friends/customers/clients (I don't know what to call you all exactly) asked me what to do in an hour long Latin grammar class (a class other than a translation class such as Cicero, Caesar, or Vergil).
Here is the ratio i always think of for an one hour class:
15 minutes quiet-ish review--Go over homework and answer questions. Students get very frustrated if you start teaching them new things without any clarification on things they do not understand.
35 minutes teach new grammar--Introduce it. Relate it to other things they have learned. Sometimes, you may have to discuss the English it relates to. Give examples and translate.
10 Minutes loud review--By loud review, I mean that you can have the students do group work or play a whole class game (chariot/relay races, Musically chairs/conjugation). This is a time for them to practice what they just learned but in a less formal manner.
Please respond with questions or comments!