As a 3D-teacher I have written a lot of tutorials through the years. Here are a couple of basic tutorials that can get you going if you are new to 3D and Maya.

Speedsculpting of Rey in Zbrush

Girl speedsculpting in Zbrush

Timelapse head-modeling in Maya

Modeling a chesterfield chair in Maya

Making of a Oh-6a Helicopter

Making of a fishingboat in Maya

Making of Aston Martin in Maya

Making of MGB 1967 in Maya

Modelling a basic head shape in Maya.
(in Norwegian)

Modelling a tire with polygons in Maya.