
The Engineer's Notebook is still in print:
https://www.amazon.com/dp/1878707035
If you download the free Kindle sample, it has some of the illustrations, but mostly just individual components.
This Reddit post has a couple of pages from Getting Started:
https://www.reddit.com/r/ECE/comments/ik1gw4/from_the_book_g...
The Internet Archive has the complete Mini-Notebook:
https://archive.org/details/Forrest_Mims-Engineers_Mini-Note...
For starters, get the "Getting Started in Electronics" , and any of his "Engineer's Mini-Notebook" series.
Specifically with the "Getting Started in Electronics" and his "Engineer's Mini-Notebook" series.
https://archive.org/search.php?query=%22Engineer%27s%20Mini-...
It can really be most worthwhile to start with the introductory Engineer's Mini-Notebook volume, "Getting Started in Electronics" where everything is so simple. Once available at Radio Shack for $2.49:
https://www.scribd.com/document/103603952/Engineer-s-Mini-No...
Then work your way through the other Engineer's Mini-Notebooks of interest and you will be able to recognize all kinds of other resources that can be helpful to build on this foundation in similar ways.
Regardless of your objective you will need a foundation in analog circuits and here's a classic reference for schematics: