Better than any book or video about parenting it’s better to learn to be calm and collected.
Your life is over, what ever it is / was it’s done. You now get the opportunity to build a new life, with a new family. When you have a baby it’s like getting a significant other which needs your assistance to do everything.
I found that just starting by giving everything up and slowly adding back a social life, work, etc worked best for me. For both kids I basically cleared my slate and saw what I could do.
In terms of preparing, I’d recommend any local parenting classes (get to know people too). You can also get the book “Nurture” (I believe it’s called). But the reality is little can prepare you, but you’ll figure it out with time. A lot of one off searches like “what to do when toddler won’t stop vomiting” are things you’ll probably need most.
Also! Set a schedule and stick to it. It makes it easier to at least know you’ll have your significant other take over in 15 min so you can sleep.