Congratulations on getting your first iPhone! If you have an Apple Store nearby, one option is to see if you can enroll in one of their "Getting Started" classes.
Here's a link. Just select the location that you would want to attend at, and if being offered the dates/times will be listed: Skills: Getting Started with iPhone - Apple
Alternately, I have been a customer of Take Control Books for years and can certainly recommend them as a good & easy reading source. These are eBooks that you can download and print out if you prefer. They cover many topics and are quite reasonably priced.
Ref: https://www.takecontrolbooks.com/product-category/ios/