Here are some ideas for how a well structured after school program can work. I worked with the Hemet Unified after school programs and they are very organized. This is what we came up with out there.

1) Homework hour should be organized into chunks. Usually when you give students an hour to work on homework, they tend to sit there daydreaming and only a few kids will actually do anything. So, if you give them about 5 minutes of quiet work time and then have them do a teach/okay, they can talk about what they completed. This means that even though kids are all working on different things, they can still teach it to a partner.
2) Use accountability! call on kids after they teach/okay and ask them to tell the class what they taught or what their partner taught.
3) Use the scoreboard with homework hour. As they work quietly and then teach/okay, give points afterward to reward or redirect.
4) Academic games can be used at the end of homework hour. You can have teachers on site send you questions for mind soccer or you can just create some trivia questions. I would get some released items from the CST and use the language and vocabulary there so that it is more beneficial in the long run.