Geometric/primitives
http://www.3dvia.com/products/3dvia-shape/ – basic 3D
http://www.123dapp.com/create – https://tinkercad.com/
http://www.sketchup.com/ – basic 3D – now Trimble not Google
Sculptural
http://pixologic.com/sculptris/ – lead in to Zbrush
http://www.123dapp.com/create – Sculpt
learningexchange.ptc.com – PTC tutorial videos
Guide to download & install Free Student Edition
Jobs & upload CV – exploiting your Creo knowledge