How to create a FTP with ClearOS

Hi everyone,

First off I just want to say that I am new to clearOS and to server management in general so please bear with me.

I have purchased a HP Mikroserver Gen 10 runing clearOS and it contians 2x4Tb harddrives.

The only function I want this machine to have is to work as a remote ftp for external contractors using portions of the internal storage as server space.

After installing clearOS and adding the apps for ftp and flexshare and creating groups and a few test users I am at a stop.

1. How do I access the internal storage and how can I create folders etc to share with specific users?
2. I am on business plan bronze but there is no storage manager in the marketplace?
3. I can't seem to find any documentations or youtube videos explaining how to do this?

Some friendly guidelines would be great to get me started