I used Joe Fugate's method of cardboard strips, masking tape and paint to form up the basic design and contours. The area is simulating a urban area hence the relatively flat land with only slight elevations.
This method of developing land and contours goes very fast, and is extremely easy to master in a short time.
Basic forms of land & contour using the cardboard strip method. Glued down and secured using hot glue...
Here is Evergreen styrene (HO scale 6x6) glued down to the roadway, to make the curbing. The road way is 30' scale in width with 5' being for the sidewalk.
Next I installed the sidewalk (1.5mm Styrene Sheet) this being a individual sheet saves having to scribe the expansion/gaps between the curbing.
Finished curb & sidewalk...
Next stage is to make the ground goop that forms the finished earth contours before adding zip texturing.