The buttons will be the social and real world application such as donation, news, and bios, there will also be a button to access the building/upgrade menu. The trash button is for getting rid of unwanted elements on the grid.
The interaction between the menu and the campus field will be simple. Tap on an item you want, the menu will disappear allowing you to tap on the area on the grid where you'd like to place the item.
Tapping on an item once it's on the grid gives you basic info about that specific thing. You can then tap away or tap the trash icon to get rid of it. There will be no confirmation messages given to these actions as I feel it will make people consider their choices more.