Forget it , is the best advice I can give. To learn to drive a Spanish heavy goods vehicle( truck) you would first have to apply for your provisional licence for trucks. I assume you already have a EU or Spanish ordinary licence. You would then have to find a driving school for HGVs and find out the costs involved. I think it would be quite expensive. You would need to be able to read, write and speak Spanish fairly fluently and at the end of it all, if you passed your test, there is no guarantee of work. Most reputable employers will only employ experienced drivers.