Another comment is that business experience is hard earned if you make too many mistakes and lose clients. It's a lot of money to practise with.

If you're really determined on moving to Madrid, and starting a new life, then great. It's a fantastic city, and has great opportunities for teaching English (my error, shouldn't have put Spanish!). Why not though, spend a year or more there first, getting back into teaching English, learning the language well, and generally looking around for an ailing language school to take over and build up again (at far lower cost)? Believe me, you will find those opportunities, and you will be better placed after building up your experience in the field. Apologies if you feel you're getting negative feedback from myself and others - believe it or not we just don't want to see you lose x thousand through being impulsive. If you're still determined to go ahead with this - please contact another owner of a language school out there (but not too close enough to be a competitor), and ask how easy/hard it is to keep regular stable work with companies going. If you get positive feedback from someone in the same industry then fine, go steaming ahead!