Have experience with drawing, but would like some formal instruction. No time for classes so which book?

Hi all. I have some experience drawing. No formal training, but began drawing at the age I could hold a pencil. Thanks to life and ADHD, drawing took a very long hiatus from my life. I would like to get back into it so I can confidently draw things I would like to paint or color in with colored pencil.

I have “The Natural Way to Draw” by Nicolaides, and my partner just showed me his copy of “Drawing On the Right Side of the Brain”. He also purchased the full kit with no plans to use it anytime soon.

I’m gone from my home 12+ hrs a day due to an expected 45 hr work week and 2 hr daily commutes. I don’t have time to really sit down for hours to draw, nor do I possess an easel to hold the drawing pad required by Nicolaides. The easel issue can be alleviated, and I like that the book is compared to formal instruction given by an art school.

I am worried I will get bored with Drawing On the Right Side of the Brain.

Do any of you have any suggestions?