Read Meghan Leahy the parenting coach who has a column in the WaPo. HEre's her website:
https://www.mlparentcoach.com/
She has great information about the different things you can expect from kids at different ages. I believe she also does phone calls when you're really stuck. I haven't read a column of hers yet where I disagree with her parenting advice. Sound, research- and evidence-based advice.
Good luck. Those were hard ages for me, and I remember thinking I was going to suck at parenting. You arent' -just by virtue of asking the question, and trying to figure things out. the people who have it all figured out are the ones who might regret their FIRM VIEWS later on.
You've got this.