[Blind-sysadmins] keeping the official free PBX distro up to date

Hi Everyone. I'm about to perform a fresh install of the official free PBX distro from freepbx.org. I was wondering if anyone has any tips on how I can keep the system up to date? I have never used cent OS before, i've used either debian or arch in the past. The online documentation seems to indicate that you can run scripts, but says they must be run in order. I'm assuming the first time I install all the updates will be pulled in automatically, but how can I maintain the system after that? Or shall I just keep free PBX up to date and leave the base install as is? Any help greatly appreciated. Cheers, Mo.