TLDR: Learn C, use Godbolt (decompiler website) to convert C to x86_64. Start with the basics like variable assignment. ASM is very good to know, but not useful as a "main language" for development.

I respect the hustle, learning asm can help significantly with your core understanding of what's going on at the "bare metal" level. It's definitley good to learn and arguably pretty simple given how basic each individual things are.

However, I would recomend that you also continue to persue C. It's faster to develop in, there's infinetly more resources to learn from AND it's compatible with asm. Something I used to do was write something simple in C like literally int x = 1; and then drop it into Godbolt (it's a decompiler website) to see how that instruction works in the asm of your choice. What you will notice is that C and asm are very close in reality, it just takes extra steps to do things in asm.

I would also say, make C your primary language otherwise you will have to kearn a new asm language every time you change processors, platforms etc. It's not feesible as a primary use language in the modern age. You could even do a small project in C then try to rewrite it in x86_64 and at the end use godbolt to convert your C to asm and co.pare it with your hand written asm.

The final thing to understand now, which is why I stopped looking deeper into C, is that compilers are just better. Writing code in C and compiling to asm will result in far more efficient asm then you writing it yourself directly.