Installing OwnCloud Server

I am considering obtaining OwnCloud Server, but am not familiar with how it works and how to set iti up. I need it for storage of Files from a number of Families who are external to my Hone Network. They would each have their own Hard Drive on my Server.
At the moment I have resurrected an old PC and have installed UBUNTU Server 18.04 on it.
Is this OK as a starting point.
Can you please lay out the steps from hereon for me.
Also; do we each need to have OwnCloud Desktop for control over system.

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Thank I will readup this documentation. Regards.