Lost & Confused

Hello,

I'm very new to this.

To date I have managed to have Multisite installed and the Network menu shows up.
The initial installation for the root has the Twenty-Eleven theme installed.
From the 133 Theme Pack I uploaded and activated the Nature theme from the Network Admin area, but the default theme still shows up.
If I switch to the Site Admin view, Appearance tab, there are no themes there, nor widgets, not menus.
The whole area is blank. It seems like I can only make changes from the Network area, but still don't see any change on the front end.

I need to have ProSite, MarketPress, BuddyPress, Directory and Classified plugins up and running, but for now it seems I can't even get a grip on setting up themes.

Please be patient with me...I am very new at this.

Thanks