Hi Taskbar,
I wrote a post a while ago on how I memorized my PAO that may help that Dai helped me with.
If your just starting making your system it will take time. play with the images in your head for each of your numbers and have a play around with it. There are plenty of numbers out there for you to try it on from car registrations to reciepts you get when shopping. Also if your having difficulty with images for people try youtube or watch some movies with that person in it. Seeing the different ways they act in person helps.
Daz