In this guide are displayed CATIA V5 steps modeling based on technical drawings 2D into 3D modeling.
With especially attention take a look the introduction of the new body which multiply holes, when the standard methods can not be used (mirrors, circular patterns ...).
CATIA Part Design Exercise - 2D into 3D Modeling
Basic features: Shaft, Groove, Pad, Pocket, Hole, Circular Patern, Fillet.
Basic entities of the sketches: Line, Circle, Arc, Rectangle.
Look this video. Thanks.