You COULD probably do it like this if you want to gain experience with ansible. Otherwise it's total overkill. Just write down a list of must-have apps that you currently use and install them manually in the new system. It's always a nice opportunity to start fresh and clean.
Just use Ouch!
Apart from what's already been mentioned, I'm eager to test Spacedrive
Spotube can do what you describe
a short click on that link will answer your questions better than I ever could
What are the best resources out there? Arch Wiki without a doubt
Doubt! The Gentoo Handbook is one of the best, if not the best documentation out there. It's especially useful for beginners because it doesn't just offer code snippets to copy/paste, but explains background knowledge and how things work.
KDL enters the chat
Even if you don't play mobile games, this is a good read: https://www.darkpattern.games/