I need to set a start date for dripped content.

I want to use this to drip content for students in a class. I'd like to create a subscription and then start the subscription on a specific date, so that all the students follow the same curriculum schedule. I would have several subscriptions all running on their own schedules. The payments don't necessarily have to coordinate exactly with the start date, but they can if that's easier.

Also, I would have some subscriptions that are setup just like they are now, that just start immediately upon signing up.

I would gladly pay for any assistance. I am a php developer, so even if you could just point me in the right direction, that would be huge. Thank you!