micheleh: Do you have any suggestions on where I might start?
Start with a workflow on paper, define what Method does for you currently and where you'll need extra screens. Build up a database schema to cover the missing parts in your process then set to building. I've really simplified this process but if you have a technical background then you know most of the process, you'll just need to get some Method hours under your belt.
I find the best way to learn Method is to reverse engineer the screens we've built. I'll also recommend our consultants here again, if you get stuck or need some help building your workflow then we've got some great people on staff here.
~C