Some issues with my Owncloud

I'm trying to figure out how to add email for users but I feel like I need to address these issues beforehand...

Can I just add 'fileinfo' to my server?
How do I configure server to 'https?'

I apologize for the 'newb' questions.

some info from my server...
Server: Localhost via UNIX socket
Server type: MySQL
Server version: 5.5.54-cll - MySQL Community Server (GPL)
Protocol version: 10
User: cpses_moxrj1cbie@localhost
Server charset: UTF-8 Unicode (utf8)

Yes, this is a PHP module / extension which needs to be enabled in your environment.

For the other messages you can find a link behind the messages leading you to the documentation where you can find all needed info to solve these messages.

If you have specific questions (not "how can i do this" questions) please create a new thread for each problem / issue you're facting.

How do I enable the fileinfo php extension?
I created a 'fileinfo.php' under the ownclouddata folder on my server but the error still shows.

This heavily depends on your used linux distribution and is nothing ownCloud specific so this question can't be answered here.

However you might find some infos about the procedure for your linux distro when searching on the net like:

php install fileinfo $yourlinux

or

php enable fileinfo $yourlinux

(replace $yourlinux with your used linux).