Newbie questions about command lines and printers

I am brand new to Ububtu and Linux. I have purchased and read a number of books about using Ubuntu. The books do a good of telling you how to install Ubuntu and all of the free software, but they assume I understand when, what and how to enter command lines.

I am retired and my first computer had Windows, so I am totally unfamiliar with using commands. Can you recommend a book or source for me?

My printer doesn’t work with Ubuntu. I would like to find inkjet printer that prints, copies and scans. I will be for personal use at home. Can you a suggest one that will work using Ububtu?

Thank you