I want to build an AMD PC for KDEnlive and VFX render over time and am looking for your shortcuts and suggestions

Hey there!

1. Is it worth it to buy server MOBOs and employ one, then two or more CPUs? Does KDEnlive or other Linux apps make use of multiple CPUs? Do I need to buy i7-i9 CPUs from the start, or a couple of i5 is okay? Where is the golden middle there?
2. What about double vCards? Can any software use these dupletes or is it more beneficial to just buy the top single vcard? Do I need to purchase some compatible vcards for that?
3. If you use KDEnlive on AMD, what are lifehacks to boost it's performance? What do you use for preview, render, proxy clips, do you use another hard drive for cache, etc? What options do you choose for preview and render?
4. Have you tried VFX software like Natron (native), emulated Resolume, Nuke or Houdini via Proton or Wine, and how it went? What suffixes to use there?

My specific application is stage plays and performances by artists that I support with dozens of clips and effects played in the background. Thing is, now the base for those are mostly gifs and vids I downloaded somewhere, with some effects I added to them, rarely something I did myself from the blank.

I want to up my game by generating complex footages myself from the ground up, and for that I need a budget beefy PC I'd build on my own pocket budget. If it's possible, I would want to have a scheduled plan to grow it overtime from a half-capable initial workstation to the end game machine, while being able to work from the very start tp finish of said upgrade.

And there I need lemmy folks to help me with their knowledge if they tried that and have some suggestions.

To be transparent and honest: I'm a russian guy, currently still there, who never served and never used my skills to help promote war efforts or service, and never planned to. I want to build my skills and leave the fuck out once I figure out the situation with my gradually degrading elders I'm a caretaker of and EU immigration policies (as I'm poor). I'm paid leaves and marbles, I mean rubles, so my budget and availiability of hardware is very limited, but I'm ready to build the workstation for VFX over two or three years if it would enable me to start to work from some basic investment right now, and that I can then upgdrade it further.