Adding plugins on multi site


I am just starting on a multi site. I want to keep a uniform look to the site so I only want one theme and all the plugins should be global as well. When I am the “network admin” the plugins don’t have an add option? When I switch over to “site admin” it’s there to add (I think) to individual sites? I haven’t set up any sites because I wanted to set the theme and plugin first.

My site is for a business networking group,

I think I want to use Blogs MU Theme. I want each member to have a nice page featuring themselves and their business with their blog, the home page would be a mashup of the latest from all members blog posts. I also need a directory listing members by name or business type.

Thank you for your help.