If you have never flown an RC craft before, I would recommend you consider a lower cost P3SE and learn to fly as a first step. Simply learning reverse navigation can take some people months to master so it's second nature to navigate when the drone is facing you, as opposed to facing away from you. Many newbies crash in the first month because of this, and it would be better to crash a $500 craft versus a $1500 craft. A used P3P or P3A would be a good option also to learn with, since it's got Lightbridge support and just works better providing a longer range, you won't outgrow it so fast as P3SE.
Before you do any commercial work you have a lot to learn to master cinematic moves with the drone, and edit video into an impressive product with value. Hone your skills for slow, smooth, cinematic flying, which is essential to offer your client a good deliverable. If your videos look bad, your referrals will be poor. Learn to fly first, learn how to use the Go app and camera settings, then create a demo reel, ask this forum to critique your demos, and when the videos look great, then consider your business options. When you find out what's required in Spain for commercial drone work, let us know the cost and process to acquire your permits/documents/certifications needed to be legal.
Are you already an accomplished photographer, or videographer? Do you know how to edit 4K video? Can you grade and edit photos? Are you setup with an adequate computer for this kind of work? Lots of things to consider for commercial work.