Beginner friendly guide to setting up an Ethereum wallet?

Hi there,

I was recently approached by someone who wanted to buy some of my digital artwork as NFT's using Ethereum, they seem to be legitimate and I have been very careful checking things out. I know very little about crypto and so far after watching several videos and an hours worth of Google searching I feel non the wiser!

Is anyone here able to point me in the direction of a VERY beginner friendly guide to setting up an Ethereum wallet and turning that currency back into national currency?

Thanks for any advice you guys can offer!