dochealth,
I think most people will find the transition to be easy. Not everything is the same (i.e. you use the command key rather than the control key for many things) but are similar (Command-C for copy, rather than control-c; Command-V for paste ... etc.)
Apple's got a site on Mac basics:
here.
I used a PC in the office, and a Mac at home, up to the time I retired. Now use a Mac exclusively. I'm very happy with it.
A search will give you lots of references to the move, like this
slightly dated one.
Keynote, Apple's PowerPoint equivalent, can also be run from an iPad (or iPhone). See
here. Create your presentation on your PC and run it from your iPad mini, or your iPhone.