Welcome back to SDL!
Vulkan is its own beast entirely. I really recommend getting a hang of SDL (and, perhaps with it, OpenGL or direct x) first.
You will have to manage more or less everything yourself when it comes to vulkan, and that is intentional. SDL has a platform indepentent accelerated 2d graphics api that might help you more than trying to get into vulkan (assuming your games are somewhat simple).
For Vulkan itself, i often see https://vulkan-tutorial.com/ recommended. They use glfw i think, but porting that to SDL is trivial.
Most things don’t change when creating vulkan windows (input, sound, whatever else all stay the same).
The sdl specific things you will need (surface creation, instance extensions etc.) are documented under https://wiki.libsdl.org/CategoryVulkan
Good luck!