Linux / CentOS - Need to set R/W only permissions for future directories

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http://serverfault.com – I have very little background in Linux of any type, so I'm completely firing off the hip to begin with. I have been asked by the boss to set up an FTP server based on CentOS. So far, things have gone as expected and I've been able to get most everything set up as I need it. When a new user is created, two folders are automatically created in the user's home directory - upload & download. I need to be able to set up permissions so that when a new user is created and the default directories are created, the user will be unable to delete anything from those folders. Any assistance on (HowTos)