The book I mentioned is a textbook, which may seem like an odd suggestion, however they are designed to be read to form an understanding from scratch. Also textbooks are updated in edition according to the latest research.
importanlty textbooks provide you with the whole picture, Evolution as a theory by itself requires much study and many years learning. A textbook will give you a summary of what we currently know in genetics, zoology, cell biology, and abiogenesis. It will take effort, but answer all your questions Before you can think to ask them as we have been asking the questions for 150 years now.
I found secular books by biologists and alike very good, but they assume a certain level of education. I came to this issue as a JW and didn't even know what science was, at age 26. I didn't know who scientists were and what they did. That textbook changed my life, so that is why I always mention it. You can get an older edition for about $20 or £15. That will suffice. Once you have the foundation knowledge, you can educate yourself on the recent developments.
Just to lastly clarify how a textbook is developed. Research is done by a scientist, they write a paper with the results, the scientific community peer review the findings, repeat the experiments, add to them etc. on rare occasions if there is fault found, they are redacted. Every 5 years or so, the science publishing industry collate all the data and publish it in the form of a textbook. Hence, we are encouraged to not use data or textbooks more than ten years old. I am currently on a cardiology ward and A+E, the lectures we had on managing many cardiology scenarios 2years ago are already out of date, with new research, new guidelines and new protocols in place. Maybe this will help put into perspective the arguments christians still use from 120 years ago, long, long ago put right by science. The christians lazily don't keep up to date with the research, but then again why would they, what would their motive be, it is counter productive for them. I was astonished at how little i knew or understood about modern human knowledge and also I am staggared at how behind christian denominations can be in their world view regarding biology, physics, chemistry and world history. ButI am acutely aware that included me not that long ago.
Sorry for the waffle x
Snare