Need some help with Aweber.

I use Aweber for my autoresponders. I am putting together a niche marketing campaign right now and I need some help to set something up.

I have created 2 squeeze pages that each offer a separate gift package for signing up to the newsletter. The first squeeze page is designed for newbies and offers a 30 day ecourse on niche marketing and the second squeeze page offers an advanced techniques ebook targeted towards intermediate marketers.

Now, I want both of these groups to end up on the same autoresponder but I don't want them to mix at the beginning. So, I don't want my intermediate subscribers to receive the newbie ecourse and I don't want to offer the advanced techniques (yet) to the newbies.

I know there is a function on Aweber that allows you to subscribe someone to another list if they subscribe to another list, but is there a way to have them subscribe to a list after another list is finished?

I would like my newbies to be put on my main list after they finish the 30 day ecourse but without receiving the advanced ebook.

The products I'm going to be promoting are useful for both these levels of marketers, so in the end they are going to be getting the same offers thrown at them.

Am I just going to have to keep them separate and post the messages to both lists? This is no problem with broadcasts of course, but I would like to have some automated messages every week.

I hope this makes sense. I've had a lot of coffee this morning and I'm a little scatter brained right now lol

Travis