ok when you first open Civil 3D you're missing the main menu pull downs for normal ACAD. type Menuload a box comes up with two tabs go to the second tab. On that tab is a pull down for ACAD, and others that are already loaded. Make sure ACAD is selected and then in the two windows below it insert the pull down menus that you'll need which is most of them. Edit, Tools, Draw, Dimension, Modify,etc..
That should help get you back on track.
BAsically I have found little difference between aCAD and Civil 3D except for new terminology in Civil 3D but, all the old ACAD stuff is there.
Heidi