thank you soo much iker! will revert to you
In my case, I installed the umbrel operating system on a raspberry pi4 I leave you here the tutorial, it explains all the steps and everything yo need:
https://umbrel.com/umbrelos#install
once installed you just have to access the store and look for the relay of nostr, it's very simple.
With a budget of 200 euros you would already have everything you need, although any old computer can be worth it.
If you get stuck or have any questions, ask and I will try to help you.
Discussion
Good luck!