AutoCAD Map 3D :: Manually Redrawing 19th Century Raster Maps?

I have to redraw 19th century raster maps that cannot be vectorized automatically.

The borders of the parcels are heavily curved.

I insert the raster map and start to trace/draw on a new layer.

1. Now, if I want to draw a second parcel that has a common curvy border with a first parcel how do I best trace the common border? What I would like is that the vertices along the common border are all displayed so I could just click them rapidly to draw the common border of the second parcel. However I cannot find a way to display all vertices. Is there a solution for this?

2. For drawing a new parcel alongside multiple existing parcels, a beter/faster option would be that I just click the vertices on junctions of the common border and the software would automatically trace the line between the junctions, create all vertices and snap them to the existing vertices on the common border of the existing parcel.