Meeting nudist is great.
Welcome to the site! Spain is fairly nudist-friendly, at least in some spots. I don't know if there is a national organization there, or if you have a local club in your area, but I recommend doing a little research on the subject.
JLMC_24 wrote:Hi! Thanks for your answer. It is great to be helped by other nudist with more wisdom in this point than me. I'll try to look for them. My only problem is that I can't pay for myself any fee from an association.
You may not have to pay anything to gain access to what they have. Many of the groups in the US, including the two national ones, have information that everybody can see without having to join. Of course, it's nice to pay something to support the club when you can do so, but in our club, we'd just like to have you participate and maybe support the club in some non-monetary way.