Parent/Child Theme (Multisite)-> Install Checkup

I just want to make sure i’m doing this correctly.

I installed Blogs MU theme in my wp-content/themes folder

-> Then I moved the mu blogs ‘child’ folder out of the mu blogs folder and relocated it to the wp-content/themes folder as well.

I then network enable the blogsmu child theme and leave the Parent theme just there floating on the ftp server. I then only proceed to update any css and what not in the ‘child’ theme. (do i have to do something to activate the css file in the child theme?)

Also – > Installing plugins – Can I install plugins through the network admin? or do i have to manually install/unzip them for multisite? ..