The worst thing you are involved its driving without a legal licence and not allowed the police to make the alcohol test.
Ask for an speaking engilsh attorney at the lawyers colegio in Alicante
Here i s the official site
The punisment its always money if you do not have more criminal problems in spain and you could get an arregment with the judge in order to get the third part of it out.
Your attorney will inform about the options you got when the police gives him your inform
In the civil part, if you are declared gilty you will have to pay for the damages because insurances do not pay when driver has got not a legal driver licence.