This tuttorial describes some methods which can be used to model terrain, as well as their advantages and disadvantages. However you must have the basic knowledge on 3d max and Photoshop.
This tutorial will guide you to make a high-poly, high-quality, extremely realistic stone wall within few minutes. You can easily apply this method to a wall with any shape and size, with any stone arrangement pattern without any problem.
A step-by-step tutorial on modelling a realistic looking tooth brush using 3D Max. Describes everything you need to so easy to understand even for beginner.