I am just about to head out for the night, so please excuse the brief response to a load of questions. From your description, I'd recommend core learning system blues level 1 and 2. You'll learn quite a few things you might not know, and have some fun.

I think blues level 1 will be easy for you, but there is enough information in there to be interesting even when it is easy. By the time you get to blues level 2, you will be working hard, and having a blast.