One of the best things about being a Product Manager is that you don’t need a particular background. But in your case, you have an advantage over people because you speak the engineer’s language.
I would recommend these two books because they really give you the preparation you need to learn about the tactical part of PM and the soft skills required to excel at your job.
The Ultimate Product Management Guide: which you can download for free here https://bit.ly/31YhGUu
The Making of a Manager https://bit.ly/2ZOo4eb