Hello @Andres GACHARNÁ
Thanks for reaching out to us, you can create a free subscription for this part, which will cost nothing if you are under the limit, however I just went through this learning process without any set up, you can skip it to the next step and pass the learning if you don't want to do a set up process.
When you want to set a default workspace, you need Azure subscription, but free subscription will not cost you anything.
https://azure.microsoft.com/en-us/products/machine-learning/
I hope this helps.
Regards,
Yutong
-Please kindly accept the answer if you feel helpful to support the community, thanks a lot.