I think at the moment, I am trying to get a daily practice. I find if I only do something for one day, by the time I come back to it, I have forgotten what I was doing ...
I have many sketchbooks and notebooks, some many years old, but I haven't had a system and I haven't had the idea of a tiny notebook to have in your handbag (although I think a list of bread, milk and potatoes will find its way into it as well). I see moleskine do some interesting little notebooks with detachable pages (also pretty covers).