open new civil 3D projcet

Attach point cloud

in home tab, go to surface dropdown and select create surface from Point Cloud

select the point cloud and then give it a name, change style

Reduce the amount of points in the 'distance between' option

choose interpolation option (or other option)

let is process and then examine the resultant surface. you can right click on surface and press object viewer to get a better preview of the surface

to edit the contours or get better contours go to the toolspace existing surfaces, right click and click surface properties.

Create a copy of current selection

create clipping border with a polyline tool (must be closed)

add border to the surface

Add labels if desired

change scale of drawing to adjust scale of labels

Mesh created