Using ALFS/LFS build as a base for a new distro, a few questions

Well, I guess this is my third post in this forum and this is going to be about LFS like the other 2. Fine, I have experience with Linux (used as my main desktop OS from 2011 to 2020 before I get a mac) and then recently, I got back to Linux somehow.

It's a long story which is irrelevant here, but I had to configure and create some systems based on Raspberry Pi and Orange Pi single board computers and you guessed it, You need Linux for those babies. I personally love to work with Linux machines, so I decided to do something myself.

I made LFS and ALFS systems before (if you look at my profile you'll realize I asked a question about ALFS in 2019) and it was an enjoyable procedure. However, I still have some big questions, since I have done a lot of stuff just for fun and learning and not as a very serious project.

• First I know BLFS exists, but I don't really know how to apply it to LFS/ALFS systems. I need some guidance for reading the book. So any tips, tricks and advice is appreciated.
• After that, I have questions about package management system. What package manager do you suggest the most? I personally tried some alternative package managers before such as pkgsrc and brew. But the distribution I made was based on Debian GNU/Linux and you can guess, I still had the power of apt in my possession.
• What about making ISO images? As I searched, LFS provides Live Scripts. Are they enough?

And I have to say that I asked pretty much the same thing on reddit as well and I didn't get the answer I needed. I hope I get here!

Thanks!