Teaching with a textbook In the past, I was only teaching graduate-level courses where I was creating the material myself. It was slides with material from various books, research papers, and my own work. Accompanied by exercises and small projects that I would build from scratch.
This year I have to teach a new undergraduate-level course. The material I need to cover is more standardized and there are at least two very good textbooks that cover the material nicely (pdfs available at the library, incl nice examples, etc.).

Should I still build my own material? It seems like a waste of time since the material is very basic and standard and I could not reach the quality of the textbooks that are at several revisions. On the other hand, I would avoid issues like this: Professor only teaches what is already in textbook. Should I quit going to the lectures?
If I teach the textbook, doesn't it feel like cheating? I mean, I'm explaining things they can find in the textbook. For some students, it's useful because they need someone to ease them into the subject before they dig deeper. For others, they can simply read the book.
Another way to go is to develop complementary material to the textbook (lab exercises, computer examples, etc.) but still, teach the book. But, I am not sure how I feel developing supplementary material to someone else's textbook.

Any experience to be shared or references?
I think that the third option is widely accepted. Students will complain about the other two, though different students and for different reasons.
The book is an outline and is a fallback for students. If it has good exercises, then they can get practice. But you will still want your own exercises to supplement in many cases, and certainly for exams. But I think a lot of, maybe most, professors follow the outline of the book even if they don't lecture precisely from it. Their exercises may be a mix of those taken from the book and those they develop themselves.
And, encourage students to take good lecture notes and not depend completely on the book.
And using your own material lets you adapt a bit for your students if they don't fit a standard model.