Blender is a free program that you can get the 2.7 version Blender.org
From my experience with Blender I started with Youtube Videos. If you would like a good channel that talks about Blender's Ins and Outs I would suggest BlenderGuru
I started with this video where he explains the process of making a donut and teaches you how to use the hotkeys and more and by the end of the entire series you will have a render of your own Doughnut and a mug.
Happy learning everyone!