A Doc to describe how to set Permissions on Inetpub / VHosts type domain folders

As the title says, I would like a Doc that explains exactly what Permissions should be set on the folders that are created by Plesk for the purpose of hosting sites. Someone who does this daily and knows it 100 % My issue is that for some reason the setup I have is not automatically creating all required permissions and I am unsure what permissions to set to make sure I have the site accessible, but also secure. For example a) the site Root [login to view URL] I want to be able to ftp to this, create folders here and in sub folders, upload files, delete files No user access to this location b) the site httpdocs same as above for ftp for me web user access for browsing etc, access to wordpress sub folders and other files for viewing like [login to view URL] [login to view URL] etc c) the site httpsdocs not sure what is required here d) an Uploads folder - for example under wp-content - what should the permissions be on that An example of my current situation, I just tried to install Wordpress via the control panel of Plesk and it says ; "Failed to install WordPress." - Downloading and Unpacking - Access denied So I am assuming the permissions are not correct on the httpdocs folder. You can use screen shots and some words, whatever you like, as long as it shows me what the best and secure permissions are for at least the a-d situations above. thanks