Clients can't save to the server, access denied no permissions, how to give permission?

First I added the machines, (iMacs) using workgroup manager, I created a guest computer then created sharepoints for the users and groups I created. Just to sharepoints, the users and groups folders on the second hard drive. Then creating the users using WGM and adding them to the sharepoint I created earlier. I did the same with the groups, I created a group and used the sharepoint as the folder to used on the server. I think I shouldn't used the HD's as sharepoints. The problem with permissions began when I tried to save work to the server. First safari gave me an error with the keychain and then I tried saving an image from the web and couldn't because of permmissions issues, or basically access denied. I propagated permissions to the wrong items and/or folders to fix the access denied issue. I don't know how to solve the issue with the permissions or the access denied to the users and thought that by propagating permissions to all the items in server admin under ACL and POSIX. That's how I messed everything up!

Yes, I created the users using WGM home tab and then clicking on the create home now and then save. No, I didn't use terminal with the command, maybe that's one of the things I needed to do so that the problems with permissions wouldn't show. I used the secondary HD to create the sharepoint folder "Users" and that's the folder I used when creating the home directory for that specific part of the setup. My setup is pretty simple, I just want a Groups folder(sharepoint) where I can store the diffrent grades or classes that come to my lab and I have a "Users" folder(sharepoint) where the kids can use to login and save their work. Later, I may add another folder to place videos so that the folder can mount when they log in and all they have to do is go to the folder and double click on the video. Can you ellaborate more on how to use the command with terminal? Would the "a" be the name of the sharepoint? I created the folders using Server Admin, I believe that clicking on the sharepoint button, there is another button that says "new", would that be the correct way to do it? When I get back to school tomorrw I will post more specifics on the way that I setup the server and maybe it will give you a better picture of how I did it.

I really appreciate your assistance, I am trying to use the limited knowledge I have to setup this lab which will enable me to do a lot of things with the kids and make their lives easier, so they don't have to bring flash drives to save their work. Thanks again for your time!

I reinstalled the server software and started from scratch. I created two sharepoints on the second hard drive, one called "grades 2013" to put all the grasdes and "students 2013" to place all the users. When I create a group I point it towards the "grades 2013" workgroup folder I created. Then, when I create a user I do the same, I connect it to the students 2013 folder I created for the students. The user shows up on the log in window but when I try to connect it says an error occurred and can't connect. Is this the right procedure where the user has to be in the user's folder and the groups in the gfroups folder?

Under Server Admin when you click on the sharepoints and look at the permissions tab, which users and/or groups must have permissions for each sharepoint. In my setup I have "classes 2013" sharepoint to connect all my groups and "students 2013" to connect the users. What goes on the ACL and POSIX sections of server admin?

When I first setup the server, the users were able to log in to their groups but weren't able to save their work with some sort of access denied or having no permissions. After reinstalling a fresh OS now I can't log in at all saying there was an error but with no code. If I create another group sharepoint, should I unshare the group folder the OS created by default? Would have to be done to the default users folder too?

I can't thank enough for your help and assistance, I followed your advice and reinstalled it , used the users and groups sharepoint made by default, applied permissions to all the users and groups created and was able to solve the problem. I will try to create othe sharepoints to store movies and pictures the kids can access to do their work.