Newbie guide for flexshare from A-Z

Hi, I have tried and I have searched but I can't get it to work.

History, I have ClearOS as a firewall/gateway basically, then I have a NAS connected to it and some computers. I would like to be able to remove my NAS and use the ClearOS server instead for that. What I want to be able to do is upload files internally by mapping a network drive to my computers, and then, access them from the outside with FTP/NetDrive or something else that is easy and quick.

How? It is so many steps that I need to get right, LDAP and groups and flexshare and ... and ... I get lost and don't get it to work.

I will son upgrade to the newest ClearOS when I buy a new Ryzen 3 when they arrives. IS there a good newbie guide somwhere that explains this step-by-step, and maybe also explains WHAT it means when I doing it so that I learn?