Not OP but I have started with https://github.com/FooBarWidget/debian-packaging-for-the-mod... - it's 4 years old but the basics are still valid. Then I would recommend the debhelper documentation. I maintain a few binary deb packages for my own repo myself. For this I would recommend reprepro.

First try updating an existing source package or adding a patch to one. Hell, just download one with `apt-get source` and just read it— look at the files that make up the source package. Then download a few more. Maybe try and build some. Change a couple files before building and see what happens.

Once you have a feel for that stuff, use debhelper to create a new package 'from scratch' (from an upstream source tarball).

This 'tutorial'¹ presents basically the same info as the Debian packaging docs² but it feels more easily digestible to me because of how it's chopped up into slides.

Some of the manpages are also good. The debhelper manpage³ refers you to other small docs, notably dh_make⁴, which is probably your best starting point for creating a package from scratch.

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1: https://www.debian.org/doc/manuals/packaging-tutorial/packag...

2: https://www.debian.org/doc/manuals/debmake-doc/ch05.en.html#...

3: https://manpages.debian.org/bullseye/debhelper/debhelper.7.e...

4: https://manpages.debian.org/testing/dh-make/dh_make.1.en.htm...

this one's pretty easy to start: https://www.internalpointers.com/post/build-binary-deb-packa...