Minimum is 24gb vram GPU. 12gb is snail speed (ok, maybe closer to typewriter speed - can use lah but your models have to fit otherwise it will spill over into system ram which is very very slow to be useable.)
If you have a spare desktop you can try running Proxmox 9 on it. Create LXC (more efficient then VM) and passthrough the GPU. Run the ollama, LiteLLM and OpenWeb UI nested dockers in the LXC. You can wire up your APIs .... Actually I have no IT background so I used Claude to help me. Use AI to build AI ....then you can use AI to defeat AI .... 以毒攻毒