As previously mentioned, we will use a lot of brushes that behave differently in order to sculpt our alien. In this section, we will take our hands over the settings that are shared between all the brushes with the Sculpt/Draw brush as an example. Let's perform the following set of steps:
In order to do our experimentation, we will use a Cube primitive. In the Object Mode, we place our cursor at the center of the scene (Shift + C) and we add a Cube (Shift + A). Note that you can use the one placed by default in any new scene if you want.
The Cube has a low polygonal resolution so we will have to subdivide it by going in to the Edit Mode, select all its components, and use the Subdivide Smooth option under the Specials menu (the W key). We will repeat this action six times in order to have a good density of polygons.
In the Sculpt Mode, we will then select the Standard brush (if not already selected) in the left panel of the 3D viewport by clicking on the brush icon button...