you want to build your own control panel you mean?
then you'll really have to look into a lot of system operations for either linux or windows, depending on the platform you'll be developing it for. choose one platform, and in the case of linux one distribution. then start with making a list of functions the control panel should perform. write down a good system design, then go and check what system tools for your chosen platform offer that. then you'll have to write the php code to access these tools.
there's a lot of stuff such a control panel should do. good luck!