If you've already installed PPM Center and are getting to the configuration of the different modules, then it's pretty much up to you what order you go in according to your business requirements & which modules you'll be using.
We have installed PPM8 onto a development environment, we haven't used PPM previously and are not sure where we should start in relation to doing the configuration. We have all of the modules installed and wanted to know if their is a logical sequence for doing the configuration - ie. resources first, portfolio, security etc. Unfortunately we have not been able to secure a resource who has implemented PPM at present.