I am studying at UAM.
Aha, I did wonder how you got a student visa, but that makes sense.
The idea was basically to start a business so I could be able to stay with a different visa status than a student one, I wouldnt like to go to all that hassle again to get my visa as a student.
Yes, your idea is good, but alas - not that simple.
I don't know how easier it would be for my fiancee to start the company and then hire me as a employee, so I could be able to issue invoices. How long would it take for her to hire me, if this is a solution?
Well, if it's for a visa - you'll have to get her to start a company and then apply for a work permit. It's not a difficult process, and it should be easy enough to get a work permit for a Spanish teacher here.
I will be the one performing the service, not her, isnt this illegal? me doing the job and her invoicing, without any contract between her and me stating I am employed by her company?
Well - if you're looking to actually work, yes, it's illegal. You'll need a work permit in this case.
Best bet - if you want to have a chat about this, I can talk to you in person about it.
I've sent you details of the weekly multinational/multilingual meeting in Poznan - if you want, you can come and I'll explain it all to you properly in person. :)