Just got a new laptop with a 5090, plan to dual boot it with Debian Like all my machines- heard it's slightly tricky to set up Debian with latest hardware- any tips?

I have a new gaming laptop, i plan to install Debian as a second OS on it

2 things:

1. What do i need to look out for with Debian on a ultra-recent laptop? I have read that 5090s require the latest drivers- but that 5000 series drivers were causing people grief on here due to Nvidia screwing up stuff- I saw some people say they avoided it by going back a driver- but since then, I hear about ...590 drivers recently? I also heard the Debain wiki did not catch people falling through the crack of a bugged NVIDIA driver that was causing problems ,and that people were recommended to manually install Nvidia Drivers(and avoid something called a run file, not too sure on what that is) -

I plan on using KDE, and ...was planning on using X11, as a lot have said Debian and Wayland and Nvidia haven't gotten things smoothed out yet- but should I attempt Wayland anyway?

I don't mind installing from Nvidia directly -but How can I ensure I get the right driver? I have done a full image back up of my system with macrium -so worst case scenario, i revert.

2. On one of my other computers, I have Debian installed as a Dual boot system. I'd like to pretty much clone that exactly , or , get exactly what i have set up there, over on this new computer when i set up Debian- is there a way to do that? If so, how?